Generating meta-notable event summary information

ABSTRACT

Techniques and mechanisms are disclosed for a data intake and query system to generate “meta-notable” events by applying a meta-notable event rule to a collection of notable event data. A meta-notable event rule specifies one or more patterns of notable event instances defined by a set of notable event states and a set of transition rules (also referred to as association rules) indicating conditions for transitioning from one notable event state to another. The set of notable event states includes at least one start state and at least one end state. A meta-notable event is generated when a set of analyzed notable events satisfies a set of transition rules linking a start state to an end state (including transitions through any intermediary states between the start state and the end state).

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims benefit under 35 U.S.C. § 120 as a continuation of U.S. application Ser. No. 15/715,015, filed Sep. 25, 2017, the entire contents of which are hereby incorporated by reference as if fully set forth herein. The applicant(s) hereby rescind any disclaimer of claim scope in the parent application(s) or the prosecution history thereof and advise the USPTO that the claims in this application may be broader than any claim in the parent application(s).

TECHNICAL FIELD

Embodiments relate generally to computer network security. More specifically, embodiments relate to techniques for detecting and investigating suspicious activity involving components of one or more computer networks.

BACKGROUND

The approaches described in this section are approaches that could be pursued, but not necessarily approaches that have been previously conceived or pursued. Therefore, unless otherwise indicated, it should not be assumed that any of the approaches described in this section qualify as prior art merely by virtue of their inclusion in this section.

Many types of organizations today rely on networked systems of computing devices for an increasingly wide variety of business operations. These networked systems often include computing devices ranging from various types of endpoint devices (for example, desktop computers, workstations, laptop computers, tablet devices, and mobile devices) to network devices and other components (for example, routers, firewalls, web servers, email servers, and so forth). The reliance on these types of systems has placed great importance on the ability to secure systems against internal and external security threats such as malware, viruses, and network-based attacks.

Organizations commonly use security information and event management (SIEM) software, endpoint threat detection and response (ETDR) applications, and other similar applications to monitor computer networks for occurrences of potential security threats. However, security threats are often multi-layered (for example, involving many different types of applications, types network activity, and so forth) and may implicate many separate components within a networked system. Efficiently detecting sophisticated network security threats and remediating threat occurrences in these environments with existing security applications remains a challenge.

BRIEF DESCRIPTION OF THE DRAWINGS

In the drawings:

FIG. 1 illustrates a networked computer environment in which an embodiment may be implemented;

FIG. 2 illustrates a block diagram of an example data intake and query system in which an embodiment may be implemented;

FIG. 3 is a flow diagram that illustrates how indexers process, index, and store data received from forwarders in accordance with the disclosed embodiments;

FIG. 4 is a flow diagram that illustrates how a search head and indexers perform a search query in accordance with the disclosed embodiments;

FIG. 5 illustrates a scenario where a common customer ID is found among log data received from three disparate sources in accordance with the disclosed embodiments;

FIG. 6A illustrates a search screen in accordance with the disclosed embodiments;

FIG. 6B illustrates a data summary dialog that enables a user to select various data sources in accordance with the disclosed embodiments;

FIGS. 7A-7D illustrate a series of user interface screens for an example data model-driven report generation interface in accordance with the disclosed embodiments;

FIG. 8 illustrates an example search query received from a client and executed by search peers in accordance with the disclosed embodiments;

FIG. 9A illustrates a key indicators view in accordance with the disclosed embodiments;

FIG. 9B illustrates an incident review dashboard in accordance with the disclosed embodiments;

FIG. 9C illustrates a proactive monitoring tree in accordance with the disclosed embodiments;

FIG. 9D illustrates a user interface screen displaying both log data and performance data in accordance with the disclosed embodiments;

FIG. 10 illustrates a block diagram of an example cloud-based data intake and query system in which an embodiment may be implemented;

FIG. 11 illustrates a block diagram of an example data intake and query system that performs searches across external data systems in accordance with the disclosed embodiments;

FIGS. 12-14 illustrate a series of user interface screens for an example data model-driven report generation interface in accordance with the disclosed embodiments;

FIGS. 15-17 illustrate example visualizations generated by a reporting application in accordance with the disclosed embodiments;

FIG. 18 illustrates a directed graph representing a generic meta-notable event rule including a set of notable event states and a set of transition rules in accordance with the disclosed embodiments;

FIG. 19 illustrates a directed graph representing a meta-notable event rule defining a particular type of network security attack in accordance with the disclosed embodiments;

FIG. 20 is a flow diagram illustrating an example process for receiving input defining a meta-notable event rule and for analyzing a collection of notable events to detect meta-notable event instances in accordance with the disclosed embodiments;

FIG. 21 is a block diagram illustrating an example system flow for detecting meta-notable events in accordance with the disclosed embodiments;

FIG. 22 illustrates an example meta-notable event dashboard interface in accordance with the disclosed embodiments;

FIG. 23 illustrates an example map display showing information about meta-notable events identified based on an applied meta-notable event rule in accordance with the disclosed embodiments;

FIG. 24 is a diagram illustrating an example probability tree visualization generated based on a set of detected meta-notable events in accordance with the disclosed embodiments;

FIG. 25 depicts an example meta-notable event dashboard including a node sequence graph in accordance with the disclosed embodiments;

FIG. 26 depicts an example meta-notable event dashboard including a selected path of a node sequence graph in accordance with the disclosed embodiments; and

FIG. 27 illustrates a computer system upon which an embodiment may be implemented.

DETAILED DESCRIPTION

Embodiments are described herein according to the following outline:

1.0. General Overview

2.0. Operating Environment

-   -   2.1. Host Devices     -   2.2. Client Devices     -   2.3. Client Device Applications     -   2.4. Data Server System     -   2.5. Data Ingestion         -   2.5.1. Input         -   2.5.2. Parsing         -   2.5.3. Indexing     -   2.6. Query Processing     -   2.7. Field Extraction     -   2.8. Example Search Screen     -   2.9. Data Modelling     -   2.10. Acceleration Techniques         -   2.10.1. Aggregation Technique         -   2.10.2. Keyword Index         -   2.10.3. High Performance Analytics Store         -   2.10.4. Accelerating Report Generation     -   2.11. Security Features     -   2.12. Data Center Monitoring     -   2.13. Cloud-Based System Overview     -   2.14. Searching Externally Archived Data         -   2.14.1. ERP Process Features

3.0. Functional Overview

-   -   3.1. Security Investigations Overview     -   3.2. Meta-Notable Framework Overview     -   3.3. Applying Meta-Notable Event Rules to Notable Event Data     -   3.4 Displaying Meta-Notable Event Information

4.0. Example Embodiments

5.0. Implementation Mechanism—Hardware Overview

6.0. Extensions and Alternatives

1.0. General Overview

Modern data centers and other computing environments can comprise anywhere from a few host computer systems to thousands of systems configured to process data, service requests from remote clients, and perform numerous other computational tasks. During operation, various components within these computing environments often generate significant volumes of machine-generated data. For example, machine data is generated by various components in the information technology (IT) environments, such as servers, sensors, routers, mobile devices, Internet of Things (IoT) devices, etc. Machine-generated data can include system logs, network packet data, sensor data, application program data, error logs, stack traces, system performance data, etc. In general, machine-generated data can also include performance data, diagnostic information, and many other types of data that can be analyzed to diagnose performance problems, monitor user interactions, and to derive other insights.

A number of tools are available to analyze machine data, that is, machine-generated data. In order to reduce the size of the potentially vast amount of machine data that may be generated, many of these tools typically pre-process the data based on anticipated data analysis needs. For example, pre-specified data items may be extracted from the machine data and stored in a database to facilitate efficient retrieval and analysis of those data items at search time. However, the rest of the machine data typically is not saved and discarded during pre-processing. As storage capacity becomes progressively cheaper and more plentiful, there are fewer incentives to discard these portions of machine data and many reasons to retain more of the data.

This plentiful storage capacity is presently making it feasible to store massive quantities of minimally processed machine data for later retrieval and analysis. In general, storing minimally processed machine data and performing analysis operations at search time can provide greater flexibility because it enables an analyst to search all of the machine data, instead of searching only a pre-specified set of data items. This may enable an analyst to investigate different aspects of the machine data that previously were unavailable for analysis.

However, analyzing and searching massive quantities of machine data presents a number of challenges. For example, a data center, servers, or network appliances may generate many different types and formats of machine data (e.g., system logs, network packet data (e.g., wire data, etc.), sensor data, application program data, error logs, stack traces, system performance data, operating system data, virtualization data, etc.) from thousands of different components, which can collectively be very time-consuming to analyze. In another example, mobile devices may generate large amounts of information relating to data accesses, application performance, operating system performance, network performance, etc. There can be millions of mobile devices that report these types of information.

These challenges can be addressed by using an event-based data intake and query system, such as the SPLUNK® ENTERPRISE system developed by Splunk Inc. of San Francisco, Calif. The SPLUNK® ENTERPRISE system is the leading platform for providing real-time operational intelligence that enables organizations to collect, index, and search machine-generated data from various websites, applications, servers, networks, and mobile devices that power their businesses. The SPLUNK® ENTERPRISE system is particularly useful for analyzing data which is commonly found in system log files, network data, and other data input sources. Although many of the techniques described herein are explained with reference to a data intake and query system similar to the SPLUNK® ENTERPRISE system, these techniques are also applicable to other types of data systems.

In the SPLUNK® ENTERPRISE system, machine-generated data are collected and stored as “events”. An event comprises a portion of the machine-generated data and is associated with a specific point in time. For example, events may be derived from “time series data,” where the time series data comprises a sequence of data points (e.g., performance measurements from a computer system, etc.) that are associated with successive points in time. In general, each event can be associated with a timestamp that is derived from the raw data in the event, determined through interpolation between temporally proximate events having known timestamps, or determined based on other configurable rules for associating timestamps with events, etc.

In some instances, machine data can have a predefined format, where data items with specific data formats are stored at predefined locations in the data. For example, the machine data may include data stored as fields in a database table. In other instances, machine data may not have a predefined format, that is, the data is not at fixed, predefined locations, but the data does have repeatable patterns and is not random. This means that some machine data can comprise various data items of different data types and that may be stored at different locations within the data. For example, when the data source is an operating system log, an event can include one or more lines from the operating system log containing raw data that includes different types of performance and diagnostic information associated with a specific point in time.

Examples of components which may generate machine data from which events can be derived include, but are not limited to, web servers, application servers, databases, firewalls, routers, operating systems, and software applications that execute on computer systems, mobile devices, sensors, Internet of Things (IoT) devices, etc. The data generated by such data sources can include, for example and without limitation, server log files, activity log files, configuration files, messages, network packet data, performance measurements, sensor measurements, etc.

The SPLUNK® ENTERPRISE system uses flexible schema to specify how to extract information from the event data. A flexible schema may be developed and redefined as needed. Note that a flexible schema may be applied to event data “on the fly,” when it is needed (e.g., at search time, index time, ingestion time, etc.). When the schema is not applied to event data until search time it may be referred to as a “late-binding schema.”

During operation, the SPLUNK® ENTERPRISE system starts with raw input data (e.g., one or more system logs, streams of network packet data, sensor data, application program data, error logs, stack traces, system performance data, etc.). The system divides this raw data into blocks (e.g., buckets of data, each associated with a specific time frame, etc.), and parses the raw data to produce timestamped events. The system stores the timestamped events in a data store. The system enables users to run queries against the stored data to, for example, retrieve events that meet criteria specified in a query, such as containing certain keywords or having specific values in defined fields. As used herein throughout, data that is part of an event is referred to as “event data”. In this context, the term “field” refers to a location in the event data containing one or more values for a specific data item. As will be described in more detail herein, the fields are defined by extraction rules (e.g., regular expressions) that derive one or more values from the portion of raw machine data in each event that has a particular field specified by an extraction rule. The set of values so produced are semantically-related (such as by IP address), even though the raw machine data in each event may be in different formats (e.g., semantically-related values may be in different positions in the events derived from different sources).

As noted above, the SPLUNK® ENTERPRISE system utilizes a late-binding schema to event data while performing queries on events. One aspect of a late-binding schema is applying “extraction rules” to event data to extract values for specific fields during search time. More specifically, the extraction rules for a field can include one or more instructions that specify how to extract a value for the field from the event data. An extraction rule can generally include any type of instruction for extracting values from data in events. In some cases, an extraction rule comprises a regular expression where a sequence of characters form a search pattern, in which case the rule is referred to as a “regex rule.” The system applies the regex rule to the event data to extract values for associated fields in the event data by searching the event data for the sequence of characters defined in the regex rule.

In the SPLUNK® ENTERPRISE system, a field extractor may be configured to automatically generate extraction rules for certain field values in the events when the events are being created, indexed, or stored, or possibly at a later time. Alternatively, a user may manually define extraction rules for fields using a variety of techniques. In contrast to a conventional schema for a database system, a late-binding schema is not defined at data ingestion time. Instead, the late-binding schema can be developed on an ongoing basis until the time a query is actually executed. This means that extraction rules for the fields in a query may be provided in the query itself, or may be located during execution of the query. Hence, as a user learns more about the data in the events, the user can continue to refine the late-binding schema by adding new fields, deleting fields, or modifying the field extraction rules for use the next time the schema is used by the system. Because the SPLUNK® ENTERPRISE system maintains the underlying raw data and uses late-binding schema for searching the raw data, it enables a user to continue investigating and learn valuable insights about the raw data.

In some embodiments, a common field name may be used to reference two or more fields containing equivalent data items, even though the fields may be associated with different types of events that possibly have different data formats and different extraction rules. By enabling a common field name to be used to identify equivalent fields from different types of events generated by disparate data sources, the system facilitates use of a “common information model” (CIM) across the disparate data sources (further discussed with respect to FIG. 5 ).

2.0. Operating Environment

FIG. 1 illustrates a networked computer system 100 in which an embodiment may be implemented. Those skilled in the art would understand that FIG. 1 represents one example of a networked computer system and other embodiments may use different arrangements.

The networked computer system 100 comprises one or more computing devices. These one or more computing devices comprise any combination of hardware and software configured to implement the various logical components described herein. For example, the one or more computing devices may include one or more memories that store instructions for implementing the various components described herein, one or more hardware processors configured to execute the instructions stored in the one or more memories, and various data repositories in the one or more memories for storing data structures utilized and manipulated by the various components.

In an embodiment, one or more client devices 102 are coupled to one or more host devices 106 and a data intake and query system 108 via one or more networks 104. Networks 104 broadly represent one or more local area networks (LANs), wide area networks (WANs), cellular networks (e.g., Long-Term Evolution (LTE), High Speed Packet Access (HSPA), 3G, and other cellular technologies), and/or networks using any of wired, wireless, terrestrial microwave, or satellite links, and may include the public Internet.

2.1. Host Devices

In the illustrated embodiment, a system 100 includes one or more host devices 106. Host devices 106 may broadly include any number of computers, virtual machine instances, and/or data centers that are configured to host or execute one or more instances of host applications 114. In general, a host device 106 may be involved, directly or indirectly, in processing requests received from client devices 102. Each host device 106 may comprise, for example, one or more of a network device, a web server, an application server, a database server, etc. A collection of host devices 106 may be configured to implement a network-based service. For example, a provider of a network-based service may configure one or more host devices 106 and host applications 114 (e.g., one or more web servers, application servers, database servers, etc.) to collectively implement the network-based application.

In general, client devices 102 communicate with one or more host applications 114 to exchange information. The communication between a client device 102 and a host application 114 may, for example, be based on the Hypertext Transfer Protocol (HTTP) or any other network protocol. Content delivered from the host application 114 to a client device 102 may include, for example, HyperText Markup Language (HTML) documents, media content, etc. The communication between a client device 102 and host application 114 may include sending various requests and receiving data packets. For example, in general, a client device 102 or application running on a client device may initiate communication with a host application 114 by making a request for a specific resource (e.g., based on an HTTP request), and the application server may respond with the requested content stored in one or more response packets.

In the illustrated embodiment, one or more of host applications 114 may generate various types of performance data during operation, including event logs, network data, sensor data, and other types of machine-generated data. For example, a host application 114 comprising a web server may generate one or more web server logs in which details of interactions between the web server and any number of client devices 102 is recorded. As another example, a host device 106 comprising a router may generate one or more router logs that record information related to network traffic managed by the router. As yet another example, a host application 114 comprising a database server may generate one or more logs that record information related to requests sent from other host applications 114 (e.g., web servers or application servers) for data managed by the database server.

2.2. Client Devices

Client devices 102 of FIG. 1 represent any computing device capable of interacting with one or more host devices 106 via a network 104. Examples of client devices 102 may include, without limitation, smart phones, tablet computers, handheld computers, wearable devices, laptop computers, desktop computers, servers, portable media players, gaming devices, and so forth. In general, a client device 102 can provide access to different content, for instance, content provided by one or more host devices 106, etc. Each client device 102 may comprise one or more client applications 110, described in more detail in a separate section hereinafter.

2.3. Client Device Applications

In an embodiment, each client device 102 may host or execute one or more client applications 110 that are capable of interacting with one or more host devices 106 via one or more networks 104. For instance, a client application 110 may be or comprise a web browser that a user may use to navigate to one or more websites or other resources provided by one or more host devices 106. As another example, a client application 110 may comprise a mobile application or “app.” For example, an operator of a network-based service hosted by one or more host devices 106 may make available one or more mobile apps that enable users of client devices 102 to access various resources of the network-based service. As yet another example, client applications 110 may include background processes that perform various operations without direct interaction from a user. A client application 110 may include a “plug-in” or “extension” to another application, such as a web browser plug-in or extension.

In an embodiment, a client application 110 may include a monitoring component 112. At a high level, the monitoring component 112 comprises a software component or other logic that facilitates generating performance data related to a client device's operating state, including monitoring network traffic sent and received from the client device and collecting other device and/or application-specific information. Monitoring component 112 may be an integrated component of a client application 110, a plug-in, an extension, or any other type of add-on component. Monitoring component 112 may also be a stand-alone process.

In one embodiment, a monitoring component 112 may be created when a client application 110 is developed, for example, by an application developer using a software development kit (SDK). The SDK may include custom monitoring code that can be incorporated into the code implementing a client application 110. When the code is converted to an executable application, the custom code implementing the monitoring functionality can become part of the application itself.

In some cases, an SDK or other code for implementing the monitoring functionality may be offered by a provider of a data intake and query system, such as a system 108. In such cases, the provider of the system 108 can implement the custom code so that performance data generated by the monitoring functionality is sent to the system 108 to facilitate analysis of the performance data by a developer of the client application or other users.

In an embodiment, the custom monitoring code may be incorporated into the code of a client application 110 in a number of different ways, such as the insertion of one or more lines in the client application code that call or otherwise invoke the monitoring component 112. As such, a developer of a client application 110 can add one or more lines of code into the client application 110 to trigger the monitoring component 112 at desired points during execution of the application. Code that triggers the monitoring component may be referred to as a monitor trigger. For instance, a monitor trigger may be included at or near the beginning of the executable code of the client application 110 such that the monitoring component 112 is initiated or triggered as the application is launched, or included at other points in the code that correspond to various actions of the client application, such as sending a network request or displaying a particular interface.

In an embodiment, the monitoring component 112 may monitor one or more aspects of network traffic sent and/or received by a client application 110. For example, the monitoring component 112 may be configured to monitor data packets transmitted to and/or from one or more host applications 114. Incoming and/or outgoing data packets can be read or examined to identify network data contained within the packets, for example, and other aspects of data packets can be analyzed to determine a number of network performance statistics. Monitoring network traffic may enable information to be gathered particular to the network performance associated with a client application 110 or set of applications.

In an embodiment, network performance data refers to any type of data that indicates information about the network and/or network performance. Network performance data may include, for instance, a Uniform Resource Locator (URL) requested, a connection type (e.g., HTTP, HTTP Secure (HTTPS), etc.), a connection start time, a connection end time, an HTTP status code, request length, response length, request headers, response headers, connection status (e.g., completion, response time(s), failure, etc.), and the like. Upon obtaining network performance data indicating performance of the network, the network performance data can be transmitted to a data intake and query system 108 for analysis.

Upon developing a client application 110 that incorporates a monitoring component 112, the client application 110 can be distributed to client devices 102. Applications generally can be distributed to client devices 102 in any manner, or they can be pre-loaded. In some cases, the application may be distributed to a client device 102 via an application marketplace or other application distribution system. For instance, an application marketplace or other application distribution system might distribute the application to a client device based on a request from the client device to download the application.

Examples of functionality that enables monitoring performance of a client device are described in U.S. patent application Ser. No. 14/524,748, entitled “UTILIZING PACKET HEADERS TO MONITOR NETWORK TRAFFIC IN ASSOCIATION WITH A CLIENT DEVICE”, filed on 27 Oct. 2014, and which is hereby incorporated by reference in its entirety for all purposes.

In an embodiment, the monitoring component 112 may also monitor and collect performance data related to one or more aspects of the operational state of a client application 110 and/or client device 102. For example, a monitoring component 112 may be configured to collect device performance information by monitoring one or more client device operations, or by making calls to an operating system and/or one or more other applications executing on a client device 102 for performance information. Device performance information may include, for instance, a current wireless signal strength of the device, a current connection type and network carrier, current memory performance information, a geographic location of the device, a device orientation, and any other information related to the operational state of the client device.

In an embodiment, the monitoring component 112 may also monitor and collect other device profile information including, for example, a type of client device, a manufacturer and model of the device, versions of various software applications installed on the device, and so forth.

In general, a monitoring component 112 may be configured to generate performance data in response to a monitor trigger in the code of a client application 110 or other triggering application event, as described above, and to store the performance data in one or more data records. Each data record, for example, may include a collection of field-value pairs, each field-value pair storing a particular item of performance data in association with a field for the item. For example, a data record generated by a monitoring component 112 may include a “networkLatency” field (not shown in the Figure) in which a value is stored. This field indicates a network latency measurement associated with one or more network requests. The data record may include a “state” field to store a value indicating a state of a network connection, and so forth for any number of aspects of collected performance data.

2.4. Data Server System

FIG. 2 depicts a block diagram of an exemplary data intake and query system 108, similar to the SPLUNK® ENTERPRISE system. System 108 includes one or more forwarders 204 that receive data from a variety of input data sources 202, and one or more indexers 206 that process and store the data in one or more data stores 208. These forwarders and indexers can comprise separate computer systems, or may alternatively comprise separate processes executing on one or more computer systems.

Each data source 202 broadly represents a distinct source of data that can be consumed by a system 108. Examples of a data source 202 include, without limitation, data files, directories of files, data sent over a network, event logs, registries, etc.

During operation, the forwarders 204 identify which indexers 206 receive data collected from a data source 202 and forward the data to the appropriate indexers. Forwarders 204 can also perform operations on the data before forwarding, including removing extraneous data, detecting timestamps in the data, parsing data, indexing data, routing data based on criteria relating to the data being routed, and/or performing other data transformations.

In an embodiment, a forwarder 204 may comprise a service accessible to client devices 102 and host devices 106 via a network 104. For example, one type of forwarder 204 may be capable of consuming vast amounts of real-time data from a potentially large number of client devices 102 and/or host devices 106. The forwarder 204 may, for example, comprise a computing device which implements multiple data pipelines or “queues” to handle forwarding of network data to indexers 206. A forwarder 204 may also perform many of the functions that are performed by an indexer. For example, a forwarder 204 may perform keyword extractions on raw data or parse raw data to create events. A forwarder 204 may generate time stamps for events. Additionally or alternatively, a forwarder 204 may perform routing of events to indexers. Data store 208 may contain events derived from machine data from a variety of sources all pertaining to the same component in an IT environment, and this data may be produced by the machine in question or by other components in the IT environment.

2.5. Data Ingestion

FIG. 3 depicts a flow chart illustrating an example data flow performed by data intake and query system 108, in accordance with the disclosed embodiments. The data flow illustrated in FIG. 3 is provided for illustrative purposes only; those skilled in the art would understand that one or more of the steps of the processes illustrated in FIG. 3 may be removed or the ordering of the steps may be changed. Furthermore, for the purposes of illustrating a clear example, one or more particular system components are described in the context of performing various operations during each of the data flow stages. For example, a forwarder is described as receiving and processing data during an input phase; an indexer is described as parsing and indexing data during parsing and indexing phases; and a search head is described as performing a search query during a search phase. However, other system arrangements and distributions of the processing steps across system components may be used.

2.5.1. Input

At block 302, a forwarder receives data from an input source, such as a data source 202 shown in FIG. 2 . A forwarder initially may receive the data as a raw data stream generated by the input source. For example, a forwarder may receive a data stream from a log file generated by an application server, from a stream of network data from a network device, or from any other source of data. In one embodiment, a forwarder receives the raw data and may segment the data stream into “blocks”, or “buckets,” possibly of a uniform data size, to facilitate subsequent processing steps.

At block 304, a forwarder or other system component annotates each block generated from the raw data with one or more metadata fields. These metadata fields may, for example, provide information related to the data block as a whole and may apply to each event that is subsequently derived from the data in the data block. For example, the metadata fields may include separate fields specifying each of a host, a source, and a source type related to the data block. A host field may contain a value identifying a host name or Internet Protocol (IP) address of a device that generated the data. A source field may contain a value identifying a source of the data, such as a pathname of a file or a protocol and port related to received network data. A source type field may contain a value specifying a particular source type label for the data. Additional metadata fields may also be included during the input phase, such as a character encoding of the data, if known, and possibly other values that provide information relevant to later processing steps. In an embodiment, a forwarder forwards the annotated data blocks to another system component (typically an indexer) for further processing.

The SPLUNK® ENTERPRISE system allows forwarding of data from one SPLUNK® ENTERPRISE instance to another, or even to a third-party system. SPLUNK® ENTERPRISE system can employ different types of forwarders in a configuration.

In an embodiment, a forwarder may contain the essential components needed to forward data. It can gather data from a variety of inputs and forward the data to a SPLUNK® ENTERPRISE server for indexing and searching. It also can tag metadata (e.g., source, source type, host, etc.).

Additionally or optionally, in an embodiment, a forwarder has the capabilities of the aforementioned forwarder as well as additional capabilities. The forwarder can parse data before forwarding the data (e.g., associate a time stamp with a portion of data and create an event, etc.) and can route data based on criteria such as source or type of event. It can also index data locally while forwarding the data to another indexer.

2.5.2. Parsing

At block 306, an indexer receives data blocks from a forwarder and parses the data to organize the data into events. In an embodiment, to organize the data into events, an indexer may determine a source type associated with each data block (e.g., by extracting a source type label from the metadata fields associated with the data block, etc.) and refer to a source type configuration corresponding to the identified source type. The source type definition may include one or more properties that indicate to the indexer to automatically determine the boundaries of events within the data. In general, these properties may include regular expression-based rules or delimiter rules where, for example, event boundaries may be indicated by predefined characters or character strings. These predefined characters may include punctuation marks or other special characters including, for example, carriage returns, tabs, spaces, line breaks, etc. If a source type for the data is unknown to the indexer, an indexer may infer a source type for the data by examining the structure of the data. Then, it can apply an inferred source type definition to the data to create the events.

At block 308, the indexer determines a timestamp for each event. Similar to the process for creating events, an indexer may again refer to a source type definition associated with the data to locate one or more properties that indicate instructions for determining a timestamp for each event. The properties may, for example, instruct an indexer to extract a time value from a portion of data in the event, to interpolate time values based on timestamps associated with temporally proximate events, to create a timestamp based on a time the event data was received or generated, to use the timestamp of a previous event, or use any other rules for determining timestamps.

At block 310, the indexer associates with each event one or more metadata fields including a field containing the timestamp (in some embodiments, a timestamp may be included in the metadata fields) determined for the event. These metadata fields may include a number of “default fields” that are associated with all events, and may also include one more custom fields as defined by a user. Similar to the metadata fields associated with the data blocks at block 304, the default metadata fields associated with each event may include a host, source, and source type field including or in addition to a field storing the timestamp.

At block 312, an indexer may optionally apply one or more transformations to data included in the events created at block 306. For example, such transformations can include removing a portion of an event (e.g., a portion used to define event boundaries, extraneous characters from the event, other extraneous text, etc.), masking a portion of an event (e.g., masking a credit card number), removing redundant portions of an event, etc. The transformations applied to event data may, for example, be specified in one or more configuration files and referenced by one or more source type definitions.

2.5.3. Indexing

At blocks 314 and 316, an indexer can optionally generate a keyword index to facilitate fast keyword searching for event data. To build a keyword index, at block 314, the indexer identifies a set of keywords in each event. At block 316, the indexer includes the identified keywords in an index, which associates each stored keyword with reference pointers to events containing that keyword (or to locations within events where that keyword is located, other location identifiers, etc.). When an indexer subsequently receives a keyword-based query, the indexer can access the keyword index to quickly identify events containing the keyword.

In some embodiments, the keyword index may include entries for name-value pairs found in events, where a name-value pair can include a pair of keywords connected by a symbol, such as an equals sign or colon. This way, events containing these name-value pairs can be quickly located. In some embodiments, fields can automatically be generated for some or all of the name-value pairs at the time of indexing. For example, if the string “dest=10.0.1.2” is found in an event, a field named “dest” may be created for the event, and assigned a value of “10.0.1.2”.

At block 318, the indexer stores the events with an associated timestamp in a data store 208. Timestamps enable a user to search for events based on a time range. In one embodiment, the stored events are organized into “buckets,” where each bucket stores events associated with a specific time range based on the timestamps associated with each event. This may not only improve time-based searching, but also allows for events with recent timestamps, which may have a higher likelihood of being accessed, to be stored in a faster memory to facilitate faster retrieval. For example, buckets containing the most recent events can be stored in flash memory rather than on a hard disk.

Each indexer 206 may be responsible for storing and searching a subset of the events contained in a corresponding data store 208. By distributing events among the indexers and data stores, the indexers can analyze events for a query in parallel. For example, using map-reduce techniques, each indexer returns partial responses for a subset of events to a search head that combines the results to produce an answer for the query. By storing events in buckets for specific time ranges, an indexer may further optimize data retrieval process by searching buckets corresponding to time ranges that are relevant to a query.

Moreover, events and buckets can also be replicated across different indexers and data stores to facilitate high availability and disaster recovery as described in U.S. patent application Ser. No. 14/266,812, entitled “SITE-BASED SEARCH AFFINITY”, filed on 30 Apr. 2014, and in U.S. patent application Ser. No. 14/266,817, entitled “MULTI-SITE CLUSTERING”, also filed on 30 Apr. 2014, each of which is hereby incorporated by reference in its entirety for all purposes.

2.6. Query Processing

FIG. 4 is a flow diagram that illustrates an exemplary process that a search head and one or more indexers may perform during a search query. At block 402, a search head receives a search query from a client. At block 404, the search head analyzes the search query to determine what portion(s) of the query can be delegated to indexers and what portions of the query can be executed locally by the search head. At block 406, the search head distributes the determined portions of the query to the appropriate indexers. In an embodiment, a search head cluster may take the place of an independent search head where each search head in the search head cluster coordinates with peer search heads in the search head cluster to schedule jobs, replicate search results, update configurations, fulfill search requests, etc. In an embodiment, the search head (or each search head) communicates with a master node (also known as a cluster master, not shown in FIG. 4 ) that provides the search head with a list of indexers to which the search head can distribute the determined portions of the query. The master node maintains a list of active indexers and can also designate which indexers may have responsibility for responding to queries over certain sets of events. A search head may communicate with the master node before the search head distributes queries to indexers to discover the addresses of active indexers.

At block 408, the indexers to which the query was distributed, search data stores associated with them for events that are responsive to the query. To determine which events are responsive to the query, the indexer searches for events that match the criteria specified in the query. These criteria can include matching keywords or specific values for certain fields. The searching operations at block 408 may use the late-binding schema to extract values for specified fields from events at the time the query is processed. In an embodiment, one or more rules for extracting field values may be specified as part of a source type definition. The indexers may then either send the relevant events back to the search head, or use the events to determine a partial result, and send the partial result back to the search head.

At block 410, the search head combines the partial results and/or events received from the indexers to produce a final result for the query. This final result may comprise different types of data depending on what the query requested. For example, the results can include a listing of matching events returned by the query, or some type of visualization of the data from the returned events. In another example, the final result can include one or more calculated values derived from the matching events.

The results generated by the system 108 can be returned to a client using different techniques. For example, one technique streams results or relevant events back to a client in real-time as they are identified. Another technique waits to report the results to the client until a complete set of results (which may include a set of relevant events or a result based on relevant events) is ready to return to the client. Yet another technique streams interim results or relevant events back to the client in real-time until a complete set of results is ready, and then returns the complete set of results to the client. In another technique, certain results are stored as “search jobs” and the client may retrieve the results by referring the search jobs.

The search head can also perform various operations to make the search more efficient. For example, before the search head begins execution of a query, the search head can determine a time range for the query and a set of common keywords that all matching events include. The search head may then use these parameters to query the indexers to obtain a superset of the eventual results. Then, during a filtering stage, the search head can perform field-extraction operations on the superset to produce a reduced set of search results. This speeds up queries that are performed on a periodic basis.

2.7. Field Extraction

The search head 210 allows users to search and visualize event data extracted from raw machine data received from homogenous data sources. It also allows users to search and visualize event data extracted from raw machine data received from heterogeneous data sources. The search head 210 includes various mechanisms, which may additionally reside in an indexer 206, for processing a query. Splunk Processing Language (SPL), used in conjunction with the SPLUNK® ENTERPRISE system, can be utilized to make a query. SPL is a pipelined search language in which a set of inputs is operated on by a first command in a command line, and then a subsequent command following the pipe symbol “|” operates on the results produced by the first command, and so on for additional commands. Other query languages, such as the Structured Query Language (“SQL”), can be used to create a query.

In response to receiving the search query, search head 210 uses extraction rules to extract values for the fields associated with a field or fields in the event data being searched. The search head 210 obtains extraction rules that specify how to extract a value for certain fields from an event. Extraction rules can comprise regex rules that specify how to extract values for the relevant fields. In addition to specifying how to extract field values, the extraction rules may also include instructions for deriving a field value by performing a function on a character string or value retrieved by the extraction rule. For example, a transformation rule may truncate a character string, or convert the character string into a different data format. In some cases, the query itself can specify one or more extraction rules.

The search head 210 can apply the extraction rules to event data that it receives from indexers 206. Indexers 206 may apply the extraction rules to events in an associated data store 208. Extraction rules can be applied to all the events in a data store, or to a subset of the events that have been filtered based on some criteria (e.g., event time stamp values, etc.). Extraction rules can be used to extract one or more values for a field from events by parsing the event data and examining the event data for one or more patterns of characters, numbers, delimiters, etc., that indicate where the field begins and, optionally, ends.

FIG. 5 illustrates an example of raw machine data received from disparate data sources. In this example, a user submits an order for merchandise using a vendor's shopping application 501 running on the user's system. In this example, the order was not delivered to the vendor's server due to a resource exception at the destination server that is detected by the middleware code 502. The user then sends a message to the customer support server 503 to complain about the order failing to complete. The three systems 501, 502, and 503 are disparate systems that do not have a common logging format. The order application 501 sends log data 504 to the SPLUNK® ENTERPRISE system in one format, the middleware code 502 sends error log data 505 in a second format, and the support server 503 sends log data 506 in a third format.

Using the log data received at one or more indexers 206 from the three systems the vendor can uniquely obtain an insight into user activity, user experience, and system behavior. The search head 210 allows the vendor's administrator to search the log data from the three systems that one or more indexers 206 are responsible for searching, thereby obtaining correlated information, such as the order number and corresponding customer ID number of the person placing the order. The system also allows the administrator to see a visualization of related events via a user interface. The administrator can query the search head 210 for customer ID field value matches across the log data from the three systems that are stored at the one or more indexers 206. The customer ID field value exists in the data gathered from the three systems, but the customer ID field value may be located in different areas of the data given differences in the architecture of the systems 13 there is a semantic relationship between the customer ID field values generated by the three systems. The search head 210 requests event data from the one or more indexers 206 to gather relevant event data from the three systems. It then applies extraction rules to the event data in order to extract field values that it can correlate. The search head may apply a different extraction rule to each set of events from each system when the event data format differs among systems. In this example, the user interface can display to the administrator the event data corresponding to the common customer ID field values 507, 508, and 509, thereby providing the administrator with insight into a customer's experience.

Note that query results can be returned to a client, a search head, or any other system component for further processing. In general, query results may include a set of one or more events, a set of one or more values obtained from the events, a subset of the values, statistics calculated based on the values, a report containing the values, or a visualization, such as a graph or chart, generated from the values.

2.8. Example Search Screen

FIG. 6A illustrates an example search screen 600 in accordance with the disclosed embodiments. Search screen 600 includes a search bar 602 that accepts user input in the form of a search string. It also includes a time range picker 612 that enables the user to specify a time range for the search. For “historical searches” the user can select a specific time range, or alternatively a relative time range, such as “today,” “yesterday” or “last week.” For “real-time searches,” the user can select the size of a preceding time window to search for real-time events. Search screen 600 also initially displays a “data summary” dialog as is illustrated in FIG. 6B that enables the user to select different sources for the event data, such as by selecting specific hosts and log files.

After the search is executed, the search screen 600 in FIG. 6A can display the results through search results tabs 604, wherein search results tabs 604 includes: an “events tab” that displays various information about events returned by the search; a “statistics tab” that displays statistics about the search results; and a “visualization tab” that displays various visualizations of the search results. The events tab illustrated in FIG. 6A displays a timeline graph 605 that graphically illustrates the number of events that occurred in one-hour intervals over the selected time range. It also displays an events list 608 that enables a user to view the raw data in each of the returned events. It additionally displays a fields sidebar 606 that includes statistics about occurrences of specific fields in the returned events, including “selected fields” that are pre-selected by the user, and “interesting fields” that are automatically selected by the system based on pre-specified criteria.

2.9. Data Models

A data model is a hierarchically structured search-time mapping of semantic knowledge about one or more datasets. It encodes the domain knowledge necessary to build a variety of specialized searches of those datasets. Those searches, in turn, can be used to generate reports.

A data model is composed of one or more “objects” (or “data model objects”) that define or otherwise correspond to a specific set of data.

Objects in data models can be arranged hierarchically in parent/child relationships. Each child object represents a subset of the dataset covered by its parent object. The top-level objects in data models are collectively referred to as “root objects.”

Child objects have inheritance. Data model objects are defined by characteristics that mostly break down into constraints and attributes. Child objects inherit constraints and attributes from their parent objects and have additional constraints and attributes of their own. Child objects provide a way of filtering events from parent objects. Because a child object always provides an additional constraint in addition to the constraints it has inherited from its parent object, the dataset it represents is always a subset of the dataset that its parent represents.

For example, a first data model object may define a broad set of data pertaining to e-mail activity generally, and another data model object may define specific datasets within the broad dataset, such as a subset of the e-mail data pertaining specifically to e-mails sent. Examples of data models can include electronic mail, authentication, databases, intrusion detection, malware, application state, alerts, compute inventory, network sessions, network traffic, performance, audits, updates, vulnerabilities, etc. Data models and their objects can be designed by knowledge managers in an organization, and they can enable downstream users to quickly focus on a specific set of data. For example, a user can simply select an “e-mail activity” data model object to access a dataset relating to e-mails generally (e.g., sent or received), or select an “e-mails sent” data model object (or data sub-model object) to access a dataset relating to e-mails sent.

A data model object may be defined by (1) a set of search constraints, and (2) a set of fields. Thus, a data model object can be used to quickly search data to identify a set of events and to identify a set of fields to be associated with the set of events. For example, an “e-mails sent” data model object may specify a search for events relating to e-mails that have been sent, and specify a set of fields that are associated with the events. Thus, a user can retrieve and use the “e-mails sent” data model object to quickly search source data for events relating to sent e-mails, and may be provided with a listing of the set of fields relevant to the events in a user interface screen.

A child of the parent data model may be defined by a search (typically a narrower search) that produces a subset of the events that would be produced by the parent data model's search. The child's set of fields can include a subset of the set of fields of the parent data model and/or additional fields. Data model objects that reference the subsets can be arranged in a hierarchical manner, so that child subsets of events are proper subsets of their parents. A user iteratively applies a model development tool (not shown in Fig.) to prepare a query that defines a subset of events and assigns an object name to that subset. A child subset is created by further limiting a query that generated a parent subset. A late-binding schema of field extraction rules is associated with each object or subset in the data model.

Data definitions in associated schemas can be taken from the common information model (CIM) or can be devised for a particular schema and optionally added to the CIM. Child objects inherit fields from parents and can include fields not present in parents. A model developer can select fewer extraction rules than are available for the sources returned by the query that defines events belonging to a model. Selecting a limited set of extraction rules can be a tool for simplifying and focusing the data model, while allowing a user flexibility to explore the data subset. Development of a data model is further explained in U.S. Pat. Nos. 8,788,525 and 8,788,526, both entitled “DATA MODEL FOR MACHINE DATA FOR SEMANTIC SEARCH”, both issued on 22 Jul. 2014, U.S. Pat. No. 8,983,994, entitled “GENERATION OF A DATA MODEL FOR SEARCHING MACHINE DATA”, issued on 17 Mar. 2015, U.S. patent application Ser. No. 14/611,232, entitled “GENERATION OF A DATA MODEL APPLIED TO QUERIES”, filed on 31 Jan. 2015, and U.S. patent application Ser. No. 14/815,884, entitled “GENERATION OF A DATA MODEL APPLIED TO OBJECT QUERIES”, filed on 31 Jul. 2015, each of which is hereby incorporated by reference in its entirety for all purposes. See, also, Knowledge Manager Manual, Build a Data Model, Splunk Enterprise 6.1.3 pp. 150-204 (Aug. 25, 2014).

A data model can also include reports. One or more report formats can be associated with a particular data model and be made available to run against the data model. A user can use child objects to design reports with object datasets that already have extraneous data pre-filtered out. In an embodiment, the data intake and query system 108 provides the user with the ability to produce reports (e.g., a table, chart, visualization, etc.) without having to enter SPL, SQL, or other query language terms into a search screen. Data models are used as the basis for the search feature.

Data models may be selected in a report generation interface. The report generator supports drag-and-drop organization of fields to be summarized in a report. When a model is selected, the fields with available extraction rules are made available for use in the report. The user may refine and/or filter search results to produce more precise reports. The user may select some fields for organizing the report and select other fields for providing detail according to the report organization. For example, “region” and “salesperson” are fields used for organizing the report and sales data can be summarized (subtotaled and totaled) within this organization. The report generator allows the user to specify one or more fields within events and apply statistical analysis on values extracted from the specified one or more fields. The report generator may aggregate search results across sets of events and generate statistics based on aggregated search results. Building reports using the report generation interface is further explained in U.S. patent application Ser. No. 14/503,335, entitled “GENERATING REPORTS FROM UNSTRUCTURED DATA”, filed on 30 Sep. 2014, and which is hereby incorporated by reference in its entirety for all purposes, and in Pivot Manual, Splunk Enterprise 6.1.3 (Aug. 4, 2014). Data visualizations also can be generated in a variety of formats, by reference to the data model. Reports, data visualizations, and data model objects can be saved and associated with the data model for future use. The data model object may be used to perform searches of other data.

FIGS. 12, 13, and 7A-7D illustrate a series of user interface screens where a user may select report generation options using data models. The report generation process may be driven by a predefined data model object, such as a data model object defined and/or saved via a reporting application or a data model object obtained from another source. A user can load a saved data model object using a report editor. For example, the initial search query and fields used to drive the report editor may be obtained from a data model object. The data model object that is used to drive a report generation process may define a search and a set of fields. Upon loading of the data model object, the report generation process may enable a user to use the fields (e.g., the fields defined by the data model object) to define criteria for a report (e.g., filters, split rows/columns, aggregates, etc.) and the search may be used to identify events (e.g., to identify events responsive to the search) used to generate the report. That is, for example, if a data model object is selected to drive a report editor, the graphical user interface of the report editor may enable a user to define reporting criteria for the report using the fields associated with the selected data model object, and the events used to generate the report may be constrained to the events that match, or otherwise satisfy, the search constraints of the selected data model object.

The selection of a data model object for use in driving a report generation may be facilitated by a data model object selection interface. FIG. 12 illustrates an example interactive data model selection graphical user interface 1200 of a report editor that displays a listing of available data models 1201. The user may select one of the data models 1202.

FIG. 13 illustrates an example data model object selection graphical user interface 1300 that displays available data objects 1301 for the selected data object model 1202. The user may select one of the displayed data model objects 1302 for use in driving the report generation process.

Once a data model object is selected by the user, a user interface screen 700 shown in FIG. 7A may display an interactive listing of automatic field identification options 701 based on the selected data model object. For example, a user may select one of the three illustrated options (e.g., the “All Fields” option 702, the “Selected Fields” option 703, or the “Coverage” option (e.g., fields with at least a specified % of coverage) 704). If the user selects the “All Fields” option 702, all of the fields identified from the events that were returned in response to an initial search query may be selected. That is, for example, all of the fields of the identified data model object fields may be selected. If the user selects the “Selected Fields” option 703, only the fields from the fields of the identified data model object fields that are selected by the user may be used. If the user selects the “Coverage” option 704, only the fields of the identified data model object fields meeting a specified coverage criteria may be selected. A percent coverage may refer to the percentage of events returned by the initial search query that a given field appears in. Thus, for example, if an object dataset includes 10,000 events returned in response to an initial search query, and the “avg_age” field appears in 854 of those 10,000 events, then the “avg_age” field would have a coverage of 8.54% for that object dataset. If, for example, the user selects the “Coverage” option and specifies a coverage value of 2%, only fields having a coverage value equal to or greater than 2% may be selected. The number of fields corresponding to each selectable option may be displayed in association with each option. For example, “97” displayed next to the “All Fields” option 702 indicates that 97 fields will be selected if the “All Fields” option is selected. The “3” displayed next to the “Selected Fields” option 703 indicates that 3 of the 97 fields will be selected if the “Selected Fields” option is selected. The “49” displayed next to the “Coverage” option 704 indicates that 49 of the 97 fields (e.g., the 49 fields having a coverage of 2% or greater) will be selected if the “Coverage” option is selected. The number of fields corresponding to the “Coverage” option may be dynamically updated based on the specified percent of coverage.

FIG. 7B illustrates an example graphical user interface screen (also called the pivot interface) 705 displaying the reporting application's “Report Editor” page. The screen may display interactive elements for defining various elements of a report. For example, the page includes a “Filters” element 706, a “Split Rows” element 707, a “Split Columns” element 708, and a “Column Values” element 709. The page may include a list of search results 711. In this example, the Split Rows element 707 is expanded, revealing a listing of fields 710 that can be used to define additional criteria (e.g., reporting criteria). The listing of fields 710 may correspond to the selected fields (attributes). That is, the listing of fields 710 may list only the fields previously selected, either automatically and/or manually by a user. FIG. 7C illustrates a formatting dialogue 712 that may be displayed upon selecting a field from the listing of fields 710. The dialogue can be used to format the display of the results of the selection (e.g., to label the column to be displayed as “optional”).

FIG. 7D illustrates an example graphical user interface screen 705 including a table of results 713 based on the selected criteria including splitting the rows by the “component” field. A column 714 having an associated count for each component listed in the table may be displayed that indicates an aggregate count of the number of times that the particular field-value pair (e.g., the value in a row) occurs in the set of events responsive to the initial search query.

FIG. 14 illustrates an example graphical user interface screen 1400 that allows the user to filter search results and to perform statistical analysis on values extracted from specific fields in the set of events. In this example, the top ten product names ranked by price are selected as a filter 1401 that causes the display of the ten most popular products sorted by price. Each row is displayed by product name and price 1402. This results in each product displayed in a column labeled “product name” along with an associated price in a column labeled “price” 1406. Statistical analysis of other fields in the events associated with the ten most popular products have been specified as column values 1403. A count of the number of successful purchases for each product is displayed in column 1404. These statistics may be produced by filtering the search results by the product name, finding all occurrences of a successful purchase in a field within the events and generating a total of the number of occurrences. A sum of the total sales is displayed in column 1405, which is a result of the multiplication of the price and the number of successful purchases for each product.

The reporting application allows the user to create graphical visualizations of the statistics generated for a report. For example, FIG. 15 illustrates an example graphical user interface 1500 that displays a set of components and associated statistical data 1501. The reporting application allows the user to select a visualization of the statistics in a graph (e.g., bar chart, scatter plot, area chart, line chart, pie chart, radial gauge, marker gauge, filler gauge, etc.). FIG. 16 illustrates an example of a bar chart visualization 1600 of an aspect of the statistical data 1501. FIG. 17 illustrates a scatter plot visualization 1700 of an aspect of the statistical data 1501.

2.10. Acceleration Technique

The above-described system provides significant flexibility by enabling a user to analyze massive quantities of minimally processed data “on the fly” at search time instead of storing pre-specified portions of the data in a database at ingestion time. This flexibility enables a user to see valuable insights, correlate data, and perform subsequent queries to examine interesting aspects of the data that may not have been apparent at ingestion time.

However, performing extraction and analysis operations at search time can involve a large amount of data and require a large number of computational operations, which can cause delays in processing the queries. Advantageously, the SPLUNK® ENTERPRISE system employs a number of unique acceleration techniques that have been developed to speed up analysis operations performed at search time. These techniques include: (1) performing search operations in parallel across multiple indexers; (2) using a keyword index; (3) using a high performance analytics store; and (4) accelerating the process of generating reports. These novel techniques are described in more detail below.

2.10.1. Aggregation Technique

To facilitate faster query processing, a query can be structured such that multiple indexers perform the query in parallel, while aggregation of search results from the multiple indexers is performed locally at the search head. For example, FIG. 8 illustrates how a search query 802 received from a client at a search head 210 can split into two phases, including: (1) subtasks 804 (e.g., data retrieval or simple filtering) that may be performed in parallel by indexers 206 for execution, and (2) a search results aggregation operation 806 to be executed by the search head when the results are ultimately collected from the indexers.

During operation, upon receiving search query 802, a search head 210 determines that a portion of the operations involved with the search query may be performed locally by the search head. The search head modifies search query 802 by substituting “stats” (create aggregate statistics over results sets received from the indexers at the search head) with “prestats” (create statistics by the indexer from local results set) to produce search query 804, and then distributes search query 804 to distributed indexers, which are also referred to as “search peers.” Note that search queries may generally specify search criteria or operations to be performed on events that meet the search criteria. Search queries may also specify field names, as well as search criteria for the values in the fields or operations to be performed on the values in the fields. Moreover, the search head may distribute the full search query to the search peers as illustrated in FIG. 4 , or may alternatively distribute a modified version (e.g., a more restricted version) of the search query to the search peers. In this example, the indexers are responsible for producing the results and sending them to the search head. After the indexers return the results to the search head, the search head aggregates the received results 806 to form a single search result set. By executing the query in this manner, the system effectively distributes the computational operations across the indexers while minimizing data transfers.

2.10.2. Keyword Index

As described above with reference to the flow charts in FIG. 3 and FIG. 4 , data intake and query system 108 can construct and maintain one or more keyword indices to quickly identify events containing specific keywords. This technique can greatly speed up the processing of queries involving specific keywords. As mentioned above, to build a keyword index, an indexer first identifies a set of keywords. Then, the indexer includes the identified keywords in an index, which associates each stored keyword with references to events containing that keyword, or to locations within events where that keyword is located. When an indexer subsequently receives a keyword-based query, the indexer can access the keyword index to quickly identify events containing the keyword.

2.10.3. High Performance Analytics Store

To speed up certain types of queries, some embodiments of system 108 create a high performance analytics store, which is referred to as a “summarization table,” that contains entries for specific field-value pairs. Each of these entries keeps track of instances of a specific value in a specific field in the event data and includes references to events containing the specific value in the specific field. For example, an example entry in a summarization table can keep track of occurrences of the value “94107” in a “ZIP code” field of a set of events and the entry includes references to all of the events that contain the value “94107” in the ZIP code field. This optimization technique enables the system to quickly process queries that seek to determine how many events have a particular value for a particular field. To this end, the system can examine the entry in the summarization table to count instances of the specific value in the field without having to go through the individual events or perform data extractions at search time. Also, if the system needs to process all events that have a specific field-value combination, the system can use the references in the summarization table entry to directly access the events to extract further information without having to search all of the events to find the specific field-value combination at search time.

In some embodiments, the system maintains a separate summarization table for each of the above-described time-specific buckets that stores events for a specific time range. A bucket-specific summarization table includes entries for specific field-value combinations that occur in events in the specific bucket. Alternatively, the system can maintain a separate summarization table for each indexer. The indexer-specific summarization table includes entries for the events in a data store that are managed by the specific indexer. Indexer-specific summarization tables may also be bucket-specific.

The summarization table can be populated by running a periodic query that scans a set of events to find instances of a specific field-value combination, or alternatively instances of all field-value combinations for a specific field. A periodic query can be initiated by a user, or can be scheduled to occur automatically at specific time intervals. A periodic query can also be automatically launched in response to a query that asks for a specific field-value combination.

In some cases, when the summarization tables may not cover all of the events that are relevant to a query, the system can use the summarization tables to obtain partial results for the events that are covered by summarization tables, but may also have to search through other events that are not covered by the summarization tables to produce additional results. These additional results can then be combined with the partial results to produce a final set of results for the query. The summarization table and associated techniques are described in more detail in U.S. Pat. No. 8,682,925, entitled “DISTRIBUTED HIGH PERFORMANCE ANALYTICS STORE”, issued on 25 Mar. 2014, U.S. patent application Ser. No. 14/170,159, entitled “SUPPLEMENTING A HIGH PERFORMANCE ANALYTICS STORE WITH EVALUATION OF INDIVIDUAL EVENTS TO RESPOND TO AN EVENT QUERY”, filed on 31 Jan. 2014, and U.S. patent application Ser. No. 14/815,973, entitled “STORAGE MEDIUM AND CONTROL DEVICE”, filed on 21 Feb. 2014, each of which is hereby incorporated by reference in its entirety.

2.10.4. Accelerating Report Generation

In some embodiments, a data server system such as the SPLUNK® ENTERPRISE system can accelerate the process of periodically generating updated reports based on query results. To accelerate this process, a summarization engine automatically examines the query to determine whether generation of updated reports can be accelerated by creating intermediate summaries. If reports can be accelerated, the summarization engine periodically generates a summary covering data obtained during a latest non-overlapping time period. For example, where the query seeks events meeting a specified criteria, a summary for the time period includes only events within the time period that meet the specified criteria. Similarly, if the query seeks statistics calculated from the events, such as the number of events that match the specified criteria, then the summary for the time period includes the number of events in the period that match the specified criteria.

In addition to the creation of the summaries, the summarization engine schedules the periodic updating of the report associated with the query. During each scheduled report update, the query engine determines whether intermediate summaries have been generated covering portions of the time period covered by the report update. If so, then the report is generated based on the information contained in the summaries. Also, if additional event data has been received and has not yet been summarized, and is required to generate the complete report, the query can be run on this additional event data. Then, the results returned by this query on the additional event data, along with the partial results obtained from the intermediate summaries, can be combined to generate the updated report. This process is repeated each time the report is updated. Alternatively, if the system stores events in buckets covering specific time ranges, then the summaries can be generated on a bucket-by-bucket basis. Note that producing intermediate summaries can save the work involved in re-running the query for previous time periods, so advantageously only the newer event data needs to be processed while generating an updated report. These report acceleration techniques are described in more detail in U.S. Pat. No. 8,589,403, entitled “COMPRESSED JOURNALING IN EVENT TRACKING FILES FOR METADATA RECOVERY AND REPLICATION”, issued on 19 Nov. 2013, U.S. Pat. No. 8,412,696, entitled “REAL TIME SEARCHING AND REPORTING”, issued on 2 Apr. 2011, and U.S. Pat. Nos. 8,589,375 and 8,589,432, both also entitled “REAL TIME SEARCHING AND REPORTING”, both issued on 19 Nov. 2013, each of which is hereby incorporated by reference in its entirety.

2.11. Security Features

The SPLUNK® ENTERPRISE platform provides various schemas, dashboards, and visualizations that simplify developers' task to create applications with additional capabilities. One such application is the SPLUNK® APP FOR ENTERPRISE SECURITY, which performs monitoring and alerting operations and includes analytics to facilitate identifying both known and unknown security threats based on large volumes of data stored by the SPLUNK® ENTERPRISE system. SPLUNK® APP FOR ENTERPRISE SECURITY provides the security practitioner with visibility into security-relevant threats found in the enterprise infrastructure by capturing, monitoring, and reporting on data from enterprise security devices, systems, and applications. Through the use of SPLUNK® ENTERPRISE searching and reporting capabilities, SPLUNK® APP FOR ENTERPRISE SECURITY provides a top-down and bottom-up view of an organization's security posture.

The SPLUNK® APP FOR ENTERPRISE SECURITY leverages SPLUNK® ENTERPRISE search-time normalization techniques, saved searches, and correlation searches to provide visibility into security-relevant threats and activity and generate notable events for tracking. The application enables the security practitioner to investigate and explore the data to find new or unknown threats that do not follow signature-based patterns.

Conventional Security Information and Event Management (SIEM) systems lack the infrastructure to effectively store and analyze large volumes of security-related data. Traditional SIEM systems typically use fixed schemas to extract data from pre-defined security-related fields at data ingestion time and store the extracted data in a relational database. This traditional data extraction process (and associated reduction in data size) that occurs at data ingestion time inevitably hampers future incident investigations that may need original data to determine the root cause of a security issue, or to detect the onset of an impending security threat.

In contrast, the SPLUNK® APP FOR ENTERPRISE SECURITY system stores large volumes of minimally processed security-related data at ingestion time for later retrieval and analysis at search time when a live security threat is being investigated. To facilitate this data retrieval process, the SPLUNK® APP FOR ENTERPRISE SECURITY provides pre-specified schemas for extracting relevant values from the different types of security-related event data and enables a user to define such schemas.

The SPLUNK® APP FOR ENTERPRISE SECURITY can process many types of security-related information. In general, this security-related information can include any information that can be used to identify security threats. For example, the security-related information can include network-related information, such as IP addresses, domain names, asset identifiers, network traffic volume, uniform resource locator strings, and source addresses. The process of detecting security threats for network-related information is further described in U.S. Pat. No. 8,826,434, entitled “SECURITY THREAT DETECTION BASED ON INDICATIONS IN BIG DATA OF ACCESS TO NEWLY REGISTERED DOMAINS”, issued on 2 Sep. 2014, U.S. patent application Ser. No. 13/956,252, entitled “INVESTIGATIVE AND DYNAMIC DETECTION OF POTENTIAL SECURITY-THREAT INDICATORS FROM EVENTS IN BIG DATA”, filed on 31 Jul. 2013, U.S. patent application Ser. No. 14/445,018, entitled “GRAPHIC DISPLAY OF SECURITY THREATS BASED ON INDICATIONS OF ACCESS TO NEWLY REGISTERED DOMAINS”, filed on 28 Jul. 2014, U.S. patent application Ser. No. 14/445,023, entitled “SECURITY THREAT DETECTION OF NEWLY REGISTERED DOMAINS”, filed on 28 Jul. 2014, U.S. patent application Ser. No. 14/815,971, entitled “SECURITY THREAT DETECTION USING DOMAIN NAME ACCESSES”, filed on 1 Aug. 2015, and U.S. patent application Ser. No. 14/815,972, entitled “SECURITY THREAT DETECTION USING DOMAIN NAME REGISTRATIONS”, filed on 1 Aug. 2015, each of which is hereby incorporated by reference in its entirety for all purposes. Security-related information can also include malware infection data and system configuration information, as well as access control information, such as login/logout information and access failure notifications. The security-related information can originate from various sources within a data center, such as hosts, virtual machines, storage devices, and sensors. The security-related information can also originate from various sources in a network, such as routers, switches, email servers, proxy servers, gateways, firewalls, and intrusion-detection systems.

During operation, the SPLUNK® APP FOR ENTERPRISE SECURITY facilitates detecting “notable events” that are likely to indicate a security threat. These notable events can be detected in a number of ways: (1) a user can notice a correlation in the data and can manually identify a corresponding group of one or more events as “notable;” or (2) a user can define a “correlation search” specifying criteria for a notable event, and every time one or more events satisfy the criteria, the application can indicate that the one or more events are notable. A user can alternatively select a pre-defined correlation search provided by the application. Note that correlation searches can be run continuously or at regular intervals (e.g., every hour) to search for notable events. Upon detection, notable events can be stored in a dedicated “notable events index,” which can be subsequently accessed to generate various visualizations containing security-related information. Also, alerts can be generated to notify system operators when important notable events are discovered.

The SPLUNK® APP FOR ENTERPRISE SECURITY provides various visualizations to aid in discovering security threats, such as a “key indicators view” that enables a user to view security metrics, such as counts of different types of notable events. For example, FIG. 9A illustrates an example key indicators view 900 that comprises a dashboard, which can display a value 901, for various security-related metrics, such as malware infections 902. It can also display a change in a metric value 903, which indicates that the number of malware infections increased by 63 during the preceding interval. Key indicators view 900 additionally displays a histogram panel 904 that displays a histogram of notable events organized by urgency values, and a histogram of notable events organized by time intervals. This key indicators view is described in further detail in pending U.S. patent application Ser. No. 13/956,338, entitled “KEY INDICATORS VIEW”, filed on 31 Jul. 2013, and which is hereby incorporated by reference in its entirety for all purposes.

These visualizations can also include an “incident review dashboard” that enables a user to view and act on “notable events.” These notable events can include: (1) a single event of high importance, such as any activity from a known web attacker; or (2) multiple events that collectively warrant review, such as a large number of authentication failures on a host followed by a successful authentication. For example, FIG. 9B illustrates an example incident review dashboard 910 that includes a set of incident attribute fields 911 that, for example, enables a user to specify a time range field 912 for the displayed events. It also includes a timeline 913 that graphically illustrates the number of incidents that occurred in time intervals over the selected time range. It additionally displays an events list 914 that enables a user to view a list of all of the notable events that match the criteria in the incident attributes fields 911. To facilitate identifying patterns among the notable events, each notable event can be associated with an urgency value (e.g., low, medium, high, critical), which is indicated in the incident review dashboard. The urgency value for a detected event can be determined based on the severity of the event and the priority of the system component associated with the event.

2.12. Data Center Monitoring

As mentioned above, the SPLUNK® ENTERPRISE platform provides various features that simplify the task of creating various applications. One such application is SPLUNK® APP FOR VMWARE® that provides operational visibility into granular performance metrics, logs, tasks and events, and topology from hosts, virtual machines and virtual centers. It empowers administrators with an accurate real-time picture of the health of the environment, proactively identifying performance and capacity bottlenecks.

Conventional data center-monitoring systems lack the infrastructure to effectively store and analyze large volumes of machine-generated data, such as performance information and log data obtained from the data center. In conventional data center-monitoring systems, machine-generated data is typically pre-processed prior to being stored, for example, by extracting pre-specified data items and storing them in a database to facilitate subsequent retrieval and analysis at search time. However, the rest of the data is not saved and discarded during pre-processing.

In contrast, the SPLUNK® APP FOR VMWARE® stores large volumes of minimally processed machine data, such as performance information and log data, at ingestion time for later retrieval and analysis at search time when a live performance issue is being investigated. In addition to data obtained from various log files, this performance-related information can include values for performance metrics obtained through an application programming interface (API) provided as part of the vSphere Hypervisor™ system distributed by VMware, Inc. of Palo Alto, Calif. For example, these performance metrics can include: (1) CPU-related performance metrics; (2) disk-related performance metrics; (3) memory-related performance metrics; (4) network-related performance metrics; (5) energy-usage statistics; (6) data-traffic-related performance metrics; (7) overall system availability performance metrics; (8) cluster-related performance metrics; and (9) virtual machine performance statistics. Such performance metrics are described in U.S. patent application Ser. No. 14/167,316, entitled “CORRELATION FOR USER-SELECTED TIME RANGES OF VALUES FOR PERFORMANCE METRICS OF COMPONENTS IN AN INFORMATION-TECHNOLOGY ENVIRONMENT WITH LOG DATA FROM THAT INFORMATION-TECHNOLOGY ENVIRONMENT”, filed on 29 Jan. 2014, and which is hereby incorporated by reference in its entirety for all purposes.

To facilitate retrieving information of interest from performance data and log files, the SPLUNK® APP FOR VMWARE® provides pre-specified schemas for extracting relevant values from different types of performance-related event data, and also enables a user to define such schemas.

The SPLUNK® APP FOR VMWARE® additionally provides various visualizations to facilitate detecting and diagnosing the root cause of performance problems. For example, one such visualization is a “proactive monitoring tree” that enables a user to easily view and understand relationships among various factors that affect the performance of a hierarchically structured computing system. This proactive monitoring tree enables a user to easily navigate the hierarchy by selectively expanding nodes representing various entities (e.g., virtual centers or computing clusters) to view performance information for lower-level nodes associated with lower-level entities (e.g., virtual machines or host systems). Example node-expansion operations are illustrated in FIG. 9C, wherein nodes 933 and 934 are selectively expanded. Note that nodes 931-939 can be displayed using different patterns or colors to represent different performance states, such as a critical state, a warning state, a normal state or an unknown/offline state. The ease of navigation provided by selective expansion in combination with the associated performance-state information enables a user to quickly diagnose the root cause of a performance problem. The proactive monitoring tree is described in further detail in U.S. patent application Ser. No. 14/253,490, entitled “PROACTIVE MONITORING TREE WITH SEVERITY STATE SORTING”, filed on 15 Apr. 2014, and U.S. patent application Ser. No. 14/812,948, also entitled “PROACTIVE MONITORING TREE WITH SEVERITY STATE SORTING”, filed on 29 Jul. 2015, each of which is hereby incorporated by reference in its entirety for all purposes.

The SPLUNK® APP FOR VMWARE® also provides a user interface that enables a user to select a specific time range and then view heterogeneous data comprising events, log data, and associated performance metrics for the selected time range. For example, the screen illustrated in FIG. 9D displays a listing of recent “tasks and events” and a listing of recent “log entries” for a selected time range above a performance-metric graph for “average CPU core utilization” for the selected time range. Note that a user is able to operate pull-down menus 942 to selectively display different performance metric graphs for the selected time range. This enables the user to correlate trends in the performance-metric graph with corresponding event and log data to quickly determine the root cause of a performance problem. This user interface is described in more detail in U.S. patent application Ser. No. 14/167,316, entitled “CORRELATION FOR USER-SELECTED TIME RANGES OF VALUES FOR PERFORMANCE METRICS OF COMPONENTS IN AN INFORMATION-TECHNOLOGY ENVIRONMENT WITH LOG DATA FROM THAT INFORMATION-TECHNOLOGY ENVIRONMENT”, filed on 29 Jan. 2014, and which is hereby incorporated by reference in its entirety for all purposes.

2.13. Cloud-Based System Overview

The example data intake and query system 108 described in reference to FIG. 2 comprises several system components, including one or more forwarders, indexers, and search heads. In some environments, a user of a data intake and query system 108 may install and configure, on computing devices owned and operated by the user, one or more software applications that implement some or all of these system components. For example, a user may install a software application on server computers owned by the user and configure each server to operate as one or more of a forwarder, an indexer, a search head, etc. This arrangement generally may be referred to as an “on-premises” solution. That is, the system 108 is installed and operates on computing devices directly controlled by the user of the system. Some users may prefer an on-premises solution because it may provide a greater level of control over the configuration of certain aspects of the system (e.g., security, privacy, standards, controls, etc.). However, other users may instead prefer an arrangement in which the user is not directly responsible for providing and managing the computing devices upon which various components of system 108 operate.

In one embodiment, to provide an alternative to an entirely on-premises environment for system 108, one or more of the components of a data intake and query system instead may be provided as a cloud-based service. In this context, a cloud-based service refers to a service hosted by one more computing resources that are accessible to end users over a network, for example, by using a web browser or other application on a client device to interface with the remote computing resources. For example, a service provider may provide a cloud-based data intake and query system by managing computing resources configured to implement various aspects of the system (e.g., forwarders, indexers, search heads, etc.) and by providing access to the system to end users via a network. Typically, a user may pay a subscription or other fee to use such a service. Each subscribing user of the cloud-based service may be provided with an account that enables the user to configure a customized cloud-based system based on the user's preferences.

FIG. 10 illustrates a block diagram of an example cloud-based data intake and query system. Similar to the system of FIG. 2 , the networked computer system 1000 includes input data sources 202 and forwarders 204. These input data sources and forwarders may be in a subscriber's private computing environment. Alternatively, they might be directly managed by the service provider as part of the cloud service. In the example system 1000, one or more forwarders 204 and client devices 1002 are coupled to a cloud-based data intake and query system 1006 via one or more networks 1004. Network 1004 broadly represents one or more LANs, WANs, cellular networks, intranetworks, internetworks, etc., using any of wired, wireless, terrestrial microwave, satellite links, etc., and may include the public Internet, and is used by client devices 1002 and forwarders 204 to access the system 1006. Similar to the system of 108, each of the forwarders 204 may be configured to receive data from an input source and to forward the data to other components of the system 1006 for further processing.

In an embodiment, a cloud-based data intake and query system 1006 may comprise a plurality of system instances 1008. In general, each system instance 1008 may include one or more computing resources managed by a provider of the cloud-based system 1006 made available to a particular subscriber. The computing resources comprising a system instance 1008 may, for example, include one or more servers or other devices configured to implement one or more forwarders, indexers, search heads, and other components of a data intake and query system, similar to system 108. As indicated above, a subscriber may use a web browser or other application of a client device 1002 to access a web portal or other interface that enables the subscriber to configure an instance 1008.

Providing a data intake and query system as described in reference to system 108 as a cloud-based service presents a number of challenges. Each of the components of a system 108 (e.g., forwarders, indexers and search heads) may at times refer to various configuration files stored locally at each component. These configuration files typically may involve some level of user configuration to accommodate particular types of data a user desires to analyze and to account for other user preferences. However, in a cloud-based service context, users typically may not have direct access to the underlying computing resources implementing the various system components (e.g., the computing resources comprising each system instance 1008), and may instead desire to make such configurations indirectly (e.g., using web-based interfaces). Thus, the techniques and systems described herein are applicable to both on-premises and cloud-based service contexts, or some combination thereof (e.g., a hybrid system where both an on-premises environment such as SPLUNK® ENTERPRISE and a cloud-based environment such as SPLUNK CLOUD™ are centrally visible).

2.14. Searching Externally Archived Data

FIG. 11 shows a block diagram of an example of a data intake and query system 108 that provides transparent search facilities for data systems that are external to the data intake and query system. Such facilities are available in the HUNK® system provided by Splunk Inc. of San Francisco, Calif. HUNK® represents an analytics platform that enables business and IT teams to rapidly explore, analyze, and visualize data in Hadoop and NoSQL data stores.

The search head 210 of the data intake and query system receives search requests from one or more client devices 1104 over network connections 1120. As discussed above, the data intake and query system 108 may reside in an enterprise location, in the cloud, etc. FIG. 11 illustrates that multiple client devices 1104 a, 1104 b, . . . , 1104 n may communicate with the data intake and query system 108. The client devices 1104 may communicate with the data intake and query system using a variety of connections. For example, one client device in FIG. 11 is illustrated as communicating over an Internet (Web) protocol, another client device is illustrated as communicating via a command line interface, and another client device is illustrated as communicating via a system developer kit (SDK).

The search head 210 analyzes the received search request to identify request parameters. If a search request received from one of the client devices 1104 references an index maintained by the data intake and query system, then the search head 210 connects to one or more indexers 206 of the data intake and query system for the index referenced in the request parameters. That is, if the request parameters of the search request reference an index, then the search head accesses the data in the index via the indexer. The data intake and query system 108 may include one or more indexers 206, depending on system access resources and requirements. As described further below, the indexers 206 retrieve data from their respective local data stores 208 as specified in the search request. The indexers and their respective data stores can comprise one or more storage devices and typically reside on the same system, though they may be connected via a local network connection.

If the request parameters of the received search request reference an external data collection, which is not accessible to the indexers 206 or under the management of the data intake and query system, then the search head 210 can access the external data collection through an External Result Provider (ERP) process 1110. An external data collection may be referred to as a “virtual index” (plural, “virtual indices”). An ERP process provides an interface through which the search head 210 may access virtual indices.

Thus, a search reference to an index of the system relates to a locally stored and managed data collection. In contrast, a search reference to a virtual index relates to an externally stored and managed data collection, which the search head may access through one or more ERP processes 1110, 1112. FIG. 11 shows two ERP processes 1110, 1112 that connect to respective remote (external) virtual indices, which are indicated as a Hadoop or another system 1114 (e.g., Amazon S3, Amazon Elastic MapReduce (EMR), other Hadoop Compatible File Systems (HCFS), etc.) and a relational database management system (RDBMS) 1116. Other virtual indices may include other file organizations and protocols, such as Structured Query Language (SQL) and the like. The ellipses between the ERP processes 1110, 1112 indicate optional additional ERP processes of the data intake and query system 108. An ERP process may be a computer process that is initiated or spawned by the search head 210 and is executed by the search data intake and query system 108. Alternatively or additionally, an ERP process may be a process spawned by the search head 210 on the same or different host system as the search head 210 resides.

The search head 210 may spawn a single ERP process in response to multiple virtual indices referenced in a search request, or the search head may spawn different ERP processes for different virtual indices. Generally, virtual indices that share common data configurations or protocols may share ERP processes. For example, all search query references to a Hadoop file system may be processed by the same ERP process, if the ERP process is suitably configured. Likewise, all search query references to an SQL database may be processed by the same ERP process. In addition, the search head may provide a common ERP process for common external data source types (e.g., a common vendor may utilize a common ERP process, even if the vendor includes different data storage system types, such as Hadoop and SQL). Common indexing schemes also may be handled by common ERP processes, such as flat text files or Weblog files.

The search head 210 determines the number of ERP processes to be initiated via the use of configuration parameters that are included in a search request message. Generally, there is a one-to-many relationship between an external results provider “family” and ERP processes. There is also a one-to-many relationship between an ERP process and corresponding virtual indices that are referred to in a search request. For example, using RDBMS, assume two independent instances of such a system by one vendor, such as one RDBMS for production and another RDBMS used for development. In such a situation, it is likely preferable (but optional) to use two ERP processes to maintain the independent operation as between production and development data. Both of the ERPs, however, will belong to the same family, because the two RDBMS system types are from the same vendor.

The ERP processes 1110, 1112 receive a search request from the search head 210. The search head may optimize the received search request for execution at the respective external virtual index. Alternatively, the ERP process may receive a search request as a result of analysis performed by the search head or by a different system process. The ERP processes 1110, 1112 can communicate with the search head 210 via conventional input/output routines (e.g., standard in/standard out, etc.). In this way, the ERP process receives the search request from a client device such that the search request may be efficiently executed at the corresponding external virtual index.

The ERP processes 1110, 1112 may be implemented as a process of the data intake and query system. Each ERP process may be provided by the data intake and query system, or may be provided by process or application providers who are independent of the data intake and query system. Each respective ERP process may include an interface application installed at a computer of the external result provider that ensures proper communication between the search support system and the external result provider. The ERP processes 1110, 1112 generate appropriate search requests in the protocol and syntax of the respective virtual indices 1114, 1116, each of which corresponds to the search request received by the search head 210. Upon receiving search results from their corresponding virtual indices, the respective ERP process passes the result to the search head 210, which may return or display the results or a processed set of results based on the returned results to the respective client device.

Client devices 1104 may communicate with the data intake and query system 108 through a network interface 1120, e.g., one or more LANs, WANs, cellular networks, intranetworks, and/or internetworks using any of wired, wireless, terrestrial microwave, satellite links, etc., and may include the public Internet.

The analytics platform utilizing the External Result Provider process described in more detail in U.S. Pat. No. 8,738,629, entitled “EXTERNAL RESULT PROVIDED PROCESS FOR RETRIEVING DATA STORED USING A DIFFERENT CONFIGURATION OR PROTOCOL”, issued on 27 May 2014, U.S. Pat. No. 8,738,587, entitled “PROCESSING A SYSTEM SEARCH REQUEST BY RETRIEVING RESULTS FROM BOTH A NATIVE INDEX AND A VIRTUAL INDEX”, issued on 25 Jul. 2013, U.S. patent application Ser. No. 14/266,832, entitled “PROCESSING A SYSTEM SEARCH REQUEST ACROSS DISPARATE DATA COLLECTION SYSTEMS”, filed on 1 May 2014, and U.S. patent application Ser. No. 14/449,144, entitled “PROCESSING A SYSTEM SEARCH REQUEST INCLUDING EXTERNAL DATA SOURCES”, filed on 31 Jul. 2014, each of which is hereby incorporated by reference in its entirety for all purposes.

2.14.1. ERP Process Features

The ERP processes described above may include two operation modes: a streaming mode and a reporting mode. The ERP processes can operate in streaming mode only, in reporting mode only, or in both modes simultaneously. Operating in both modes simultaneously is referred to as mixed mode operation. In a mixed mode operation, the ERP at some point can stop providing the search head with streaming results and only provide reporting results thereafter, or the search head at some point may start ignoring streaming results it has been using and only use reporting results thereafter.

The streaming mode returns search results in real time, with minimal processing, in response to the search request. The reporting mode provides results of a search request with processing of the search results prior to providing them to the requesting search head, which in turn provides results to the requesting client device. ERP operation with such multiple modes provides greater performance flexibility with regard to report time, search latency, and resource utilization.

In a mixed mode operation, both streaming mode and reporting mode are operating simultaneously. The streaming mode results (e.g., the raw data obtained from the external data source) are provided to the search head, which can then process the results data (e.g., break the raw data into events, timestamp it, filter it, etc.) and integrate the results data with the results data from other external data sources, and/or from data stores of the search head. The search head performs such processing and can immediately start returning interim (streaming mode) results to the user at the requesting client device; simultaneously, the search head is waiting for the ERP process to process the data it is retrieving from the external data source as a result of the concurrently executing reporting mode.

In some instances, the ERP process initially operates in a mixed mode, such that the streaming mode operates to enable the ERP quickly to return interim results (e.g., some of the raw or unprocessed data necessary to respond to a search request) to the search head, enabling the search head to process the interim results and begin providing to the client or search requester interim results that are responsive to the query. Meanwhile, in this mixed mode, the ERP also operates concurrently in reporting mode, processing portions of raw data in a manner responsive to the search query. Upon determining that it has results from the reporting mode available to return to the search head, the ERP may halt processing in the mixed mode at that time (or some later time) by stopping the return of data in streaming mode to the search head and switching to reporting mode only. The ERP at this point starts sending interim results in reporting mode to the search head, which in turn may then present this processed data responsive to the search request to the client or search requester. Typically the search head switches from using results from the ERP's streaming mode of operation to results from the ERP's reporting mode of operation when the higher bandwidth results from the reporting mode outstrip the amount of data processed by the search head in the] streaming mode of ERP operation.

A reporting mode may have a higher bandwidth because the ERP does not have to spend time transferring data to the search head for processing all the raw data. In addition, the ERP may optionally direct another processor to do the processing.

The streaming mode of operation does not need to be stopped to gain the higher bandwidth benefits of a reporting mode; the search head could simply stop using the streaming mode results—and start using the reporting mode results—when the bandwidth of the reporting mode has caught up with or exceeded the amount of bandwidth provided by the streaming mode. Thus, a variety of triggers and ways to accomplish a search head's switch from using streaming mode results to using reporting mode results may be appreciated by one skilled in the art.

The reporting mode can involve the ERP process (or an external system) performing event breaking, time stamping, filtering of events to match the search query request, and calculating statistics on the results. The user can request particular types of data, such as if the search query itself involves types of events, or the search request may ask for statistics on data, such as on events that meet the search request. In either case, the search head understands the query language used in the received query request, which may be a proprietary language. One exemplary query language is Splunk Processing Language (SPL) developed by the assignee of the application, Splunk Inc. The search head typically understands how to use that language to obtain data from the indexers, which store data in a format used by the SPLUNK® Enterprise system.

The ERP processes support the search head, as the search head is not ordinarily configured to understand the format in which data is stored in external data sources such as Hadoop or SQL data systems. Rather, the ERP process performs that translation from the query submitted in the search support system's native format (e.g., SPL if SPLUNK® ENTERPRISE is used as the search support system) to a search query request format that will be accepted by the corresponding external data system. The external data system typically stores data in a different format from that of the search support system's native index format, and it utilizes a different query language (e.g., SQL or MapReduce, rather than SPL or the like).

As noted, the ERP process can operate in the streaming mode alone. After the ERP process has performed the translation of the query request and received raw results from the streaming mode, the search head can integrate the returned data with any data obtained from local data sources (e.g., native to the search support system), other external data sources, and other ERP processes (if such operations were required to satisfy the terms of the search query). An advantage of mixed mode operation is that, in addition to streaming mode, the ERP process is also executing concurrently in reporting mode. Thus, the ERP process (rather than the search head) is processing query results (e.g., performing event breaking, timestamping, filtering, possibly calculating statistics if required to be responsive to the search query request, etc.). It should be apparent to those skilled in the art that additional time is needed for the ERP process to perform the processing in such a configuration. Therefore, the streaming mode will allow the search head to start returning interim results to the user at the client device before the ERP process can complete sufficient processing to start returning any search results. The switchover between streaming and reporting mode happens when the ERP process determines that the switchover is appropriate, such as when the ERP process determines it can begin returning meaningful results from its reporting mode.

The operation described above illustrates the source of operational latency: streaming mode has low latency (immediate results) and usually has relatively low bandwidth (fewer results can be returned per unit of time). In contrast, the concurrently running reporting mode has relatively high latency (it has to perform a lot more processing before returning any results) and usually has relatively high bandwidth (more results can be processed per unit of time). For example, when the ERP process does begin returning report results, it returns more processed results than in the streaming mode, because, e.g., statistics only need to be calculated to be responsive to the search request. That is, the ERP process doesn't have to take time to first return raw data to the search head. As noted, the ERP process could be configured to operate in streaming mode alone and return just the raw data for the search head to process in a way that is responsive to the search request. Alternatively, the ERP process can be configured to operate in the reporting mode only. Also, the ERP process can be configured to operate in streaming mode and reporting mode concurrently, as described, with the ERP process stopping the transmission of streaming results to the search head when the concurrently running reporting mode has caught up and started providing results. The reporting mode does not require the processing of all raw data that is responsive to the search query request before the ERP process starts returning results; rather, the reporting mode usually performs processing of chunks of events and returns the processing results to the search head for each chunk.

For example, an ERP process can be configured to merely return the contents of a search result file verbatim, with little or no processing of results. That way, the search head performs all processing (such as parsing byte streams into events, filtering, etc.). The ERP process can be configured to perform additional intelligence, such as analyzing the search request and handling all the computation that a native search indexer process would otherwise perform. In this way, the configured ERP process provides greater flexibility in features while operating according to desired preferences, such as response latency and resource requirements.

2.14. IT Service Monitoring

As previously mentioned, the SPLUNK® ENTERPRISE platform provides various schemas, dashboards and visualizations that make it easy for developers to create applications to provide additional capabilities. One such application is SPLUNK® IT SERVICE INTELLIGENCE™, which performs monitoring and alerting operations. It also includes analytics to help an analyst diagnose the root cause of performance problems based on large volumes of data stored by the SPLUNK® ENTERPRISE system as correlated to the various services an IT organization provides (a service-centric view). This differs significantly from conventional IT monitoring systems that lack the infrastructure to effectively store and analyze large volumes of service-related event data. Traditional service monitoring systems typically use fixed schemas to extract data from pre-defined fields at data ingestion time, wherein the extracted data is typically stored in a relational database. This data extraction process and associated reduction in data content that occurs at data ingestion time inevitably hampers future investigations, when all of the original data may be needed to determine the root cause of or contributing factors to a service issue.

In contrast, a SPLUNK® IT SERVICE INTELLIGENCE™ system stores large volumes of minimally-processed service-related data at ingestion time for later retrieval and analysis at search time, to perform regular monitoring, or to investigate a service issue. To facilitate this data retrieval process, SPLUNK® IT SERVICE INTELLIGENCE™ enables a user to define an IT operations infrastructure from the perspective of the services it provides. In this service-centric approach, a service such as corporate e-mail may be defined in terms of the entities employed to provide the service, such as host machines and network devices. Each entity is defined to include information for identifying all of the event data that pertains to the entity, whether produced by the entity itself or by another machine, and considering the many various ways the entity may be identified in raw machine data (such as by a URL, an IP address, or machine name). The service and entity definitions can organize event data around a service so that all of the event data pertaining to that service can be easily identified. This capability provides a foundation for the implementation of Key Performance Indicators.

One or more Key Performance Indicators (KPI's) are defined for a service within the SPLUNK® IT SERVICE INTELLIGENCE™ application. Each KPI measures an aspect of service performance at a point in time or over a period of time (aspect KPI's). Each KPI is defined by a search query that derives a KPI value from the machine data of events associated with the entities that provide the service. Information in the entity definitions may be used to identify the appropriate events at the time a KPI is defined or whenever a KPI value is being determined. The KPI values derived over time may be stored to build a valuable repository of current and historical performance information for the service, and the repository, itself, may be subject to search query processing. Aggregate KPIs may be defined to provide a measure of service performance calculated from a set of service aspect KPI values; this aggregate may even be taken across defined timeframes and/or across multiple services. A particular service may have an aggregate KPI derived from substantially all of the aspect KPI's of the service to indicate an overall health score for the service.

SPLUNK® IT SERVICE INTELLIGENCE™ facilitates the production of meaningful aggregate KPI's through a system of KPI thresholds and state values. Different KPI definitions may produce values in different ranges, and so the same value may mean something very different from one KPI definition to another. To address this, SPLUNK® IT SERVICE INTELLIGENCE™ implements a translation of individual KPI values to a common domain of “state” values. For example, a KPI range of values may be 1-100, or 50-275, while values in the state domain may be ‘critical,’ ‘warning,’ ‘normal,’ and ‘informational’. Thresholds associated with a particular KPI definition determine ranges of values for that KPI that correspond to the various state values. In one case, KPI values 95-100 may be set to correspond to ‘critical’ in the state domain. KPI values from disparate KPI's can be processed uniformly once they are translated into the common state values using the thresholds. For example, “normal 80% of the time” can be applied across various KPI's. To provide meaningful aggregate KPI's, a weighting value can be assigned to each KPI so that its influence on the calculated aggregate KPI value is increased or decreased relative to the other KPI's.

One service in an IT environment often impacts, or is impacted by, another service. SPLUNK® IT SERVICE INTELLIGENCE™ can reflect these dependencies. For example, a dependency relationship between a corporate e-mail service and a centralized authentication service can be reflected by recording an association between their respective service definitions. The recorded associations establish a service dependency topology that informs the data or selection options presented in a graphical user interface (GUI), for example. (The service dependency topology is like a “map” showing how services are connected based on their dependencies.) The service topology may itself be depicted in a GUI and may be interactive to allow navigation among related services.

Entity definitions in SPLUNK® IT SERVICE INTELLIGENCE™ can include informational fields that can serve as metadata, implied data fields, or attributed data fields for the events identified by other aspects of the entity definition. Entity definitions in SPLUNK® IT SERVICE INTELLIGENCE™ can also be created and updated by an import of tabular data (as represented in a comma-separate values (CSV) file, another delimited file, or a search query result set). The import may be GUI-mediated or processed using import parameters from a GUI-based import definition process. Entity definitions in SPLUNK® IT SERVICE INTELLIGENCE™ can also be associated with a service by means of a service definition rule. Processing the rule results in the matching entity definitions being associated with the service definition. The rule can be processed at creation time, and thereafter on a scheduled or on-demand basis. This allows dynamic, rule-based updates to the service definition.

During operation, SPLUNK® IT SERVICE INTELLIGENCE™ can recognize so-called “notable events” that may indicate a service performance problem or other situation of interest. These notable events can be recognized by a “correlation search” specifying trigger criteria for a notable event: every time KPI values satisfy the criteria, the application indicates a notable event. A severity level for the notable event may also be specified. Furthermore, when trigger criteria are satisfied, the correlation search may additionally or alternatively cause a service ticket to be created in an IT service management (ITSM) system, such as a systems available from ServiceNow, Inc., of Santa Clara, Calif.

SPLUNK® IT SERVICE INTELLIGENCE™ provides various visualizations built on its service-centric organization of event data and the KPI values generated and collected. Visualizations can be particularly useful for monitoring or investigating service performance. SPLUNK® IT SERVICE INTELLIGENCE™ provides a service monitoring interface suitable as the home page for ongoing IT service monitoring. The interface is appropriate for settings such as desktop use or for a wall-mounted display in a network operations center (NOC). The interface may prominently display a services health section with tiles for the aggregate KPI's indicating overall health for defined services and a general KPI section with tiles for KPI's related to individual service aspects. These tiles may display KPI information in a variety of ways, such as by being colored and ordered according to factors like the KPI state value. They also can be interactive and navigate to visualizations of more detailed KPI information.

SPLUNK® IT SERVICE INTELLIGENCE™ provides a service-monitoring dashboard visualization based on a user-defined template. The template can include user-selectable widgets of varying types and styles to display KPI information. The content and the appearance of widgets can respond dynamically to changing KPI information. The KPI widgets can appear in conjunction with a background image, user drawing objects, or other visual elements, that depict the IT operations environment, for example. The KPI widgets or other GUI elements can be interactive so as to provide navigation to visualizations of more detailed KPI information.

SPLUNK® IT SERVICE INTELLIGENCE™ provides a visualization showing detailed time-series information for multiple KPI's in parallel graph lanes. The length of each lane can correspond to a uniform time range, while the width of each lane may be automatically adjusted to fit the displayed KPI data. Data within each lane may be displayed in a user selectable style, such as a line, area, or bar chart. During operation a user may select a position in the time range of the graph lanes to activate lane inspection at that point in time. Lane inspection may display an indicator for the selected time across the graph lanes and display the KPI value associated with that point in time for each of the graph lanes. The visualization may also provide navigation to an interface for defining a correlation search, using information from the visualization to pre-populate the definition.

SPLUNK® IT SERVICE INTELLIGENCE™ provides a visualization for incident review showing detailed information for notable events. The incident review visualization may also show summary information for the notable events over a time frame, such as an indication of the number of notable events at each of a number of severity levels. The severity level display may be presented as a rainbow chart with the warmest color associated with the highest severity classification. The incident review visualization may also show summary information for the notable events over a time frame, such as the number of notable events occurring within segments of the time frame. The incident review visualization may display a list of notable events within the time frame ordered by any number of factors, such as time or severity. The selection of a particular notable event from the list may display detailed information about that notable event, including an identification of the correlation search that generated the notable event.

SPLUNK® IT SERVICE INTELLIGENCE™ provides pre-specified schemas for extracting relevant values from the different types of service-related event data. It also enables a user to define such schemas.

3.0. Functional Overview

Approaches, techniques, and mechanisms are disclosed related to a new “meta-notable” event framework. According to embodiments described herein, a meta-notable event framework allows users to define patterns of notable event data of interest and enables a security application to detect occurrences of defined notable event patterns. In an embodiment, a security application generates a new type of event, referred to herein as a meta-notable event, in response to detecting a defined meta-notable event pattern. At a high level, a meta-notable event identifies a set of notable events satisfying an associated notable event pattern and can provide greater insight into the event data comprising the separate notable events.

As used herein, a notable event refers to a type of event generated by a data intake and query system 108 to identify event data of particular interest (for example, from event data stored by indexers 206 in one or more data stores 208). Examples of generating and using notable events are described in at least Section 2.11. As indicated in Section 2.11 and elsewhere herein, a notable event can be generated in several ways including in response to a user manually selecting one or more events considered to be notable to the user (for example, the events can be selected from a search results list of events) or in response to identification of an event or pattern of events matching the criteria of a correlation search.

In an embodiment, a correlation search refers to a type of search that evaluates events from one or more data sources to identify events matching specified criteria or defined event relationships. For example, a correlation search can be configured to search for groups of events that share or more common field values or other relationships, for individual events that include one or more values exceeding a defined threshold, or for events having any types of defined characteristics. A correlation search can be run continuously or at regular intervals (for example, every hour) to search for notable events as new event data arrives. The event data from which notable events are generated can be based broadly on any type of machine-generated data related to the activity, operation, or status of computing devices or other components of an information technology or security environment. For example, types of computing devices and other components to which event data might relate include, but are not limited to, servers, networking devices, databases, desktop computers, workstations, laptop computers, tablet computers, mobile devices, applications, and so forth. Notable events can be stored in a “notable events index” which can be accessed to generate various dashboards, visualizations, and alerts containing information related to the indexed notable events.

In the example context of a security application (for example, the SPLUNK® APP FOR ENTERPRISE SECURITY described above in Section 2.11), a security analyst might use a data intake and query system 108 to define various correlation searches to detect suspicious events or patterns of event data generated based on data sources related to a monitored computer network. For example, the event data might include events indicating potential malware or virus infections, network-based attacks, user access attacks, or other security threats affecting one or more computing devices on the network. In this environment, an analyst might create one correlation search to identify event data indicating that any host on the network experienced an unauthorized system access. Another correlation search might be created to identify event data indicating that any host on the network communicated with an external server on a known threat list. Yet another correlation search might identify event data indicating a potential occurrence of an unauthorized transfer of secure data outside of the network, and so forth.

Notable events generated by each of the separate correlation searches described above might be interesting to an analyst in insolation and can aid the analyst as part of a larger security investigation. However, an analyst might often be even more interested in relationships among detected notable events and knowing which notable events are likely to be most significant to an investigation. As one example, knowledge that a particular server experienced an unauthorized system access, that the same server subsequently established connections with several external servers on a known threat list, and further that the same server was associated with network traffic indicating an occurrence of secure data exfiltration might provide a more comprehensive and useful view of a large-scale network security attack. However, these types of relationships among notable events can be difficult to identify manually and are prone to being overlooked entirely if an analyst only has access to lists of notable events generated by separate correlation searches, particularly as the number of notable events generated by separate correlation searches grows.

While users often are unable to use individual queries to express intricate correlations and patterns of event data similar to the example above, the meta-notable framework described herein enables users to intuitively specify such correlations and patterns by formally expressing event correlations and patterns in terms of underlying notable events. Referring again to the example correlation searches above, a user might define a meta-notable pattern to include detection of a first notable event indicating an unauthorized system access at a server X, followed by detection of a second notable event indicating that the same server X established a network connection with an external server Y on a threat list, followed by detection of a third notable event indicating that the same server X sent data to the server Y within five minutes of the first notable event occurring. As described in more detail hereinafter, a meta-notable event generally can be defined by any one or more patterns of notable event states and relationships between notable event states (for example, based on field values shared among notable events, temporal constraints between notable events, and so forth).

According to one embodiment, a data intake and query system generates meta-notable events by applying a meta-notable event rule to a collection of notable events. A meta-notable event rule specifies one or more patterns of notable event instances defined by a set of notable event states and a set of transition rules (also referred to as association rules) indicating conditions for transitioning from one notable event state to another. The set of notable event states includes at least one start state and at least one end state. A meta-notable event is generated when a set of notable events satisfying a plurality of transition rules linking a start state to an end state (including transitions through any intermediary states between the start state and the end state) is identified in an analyzed collection of notable events.

According to embodiments described herein, a network security application generates and causes display of graphical user interfaces (GUIs) including various dashboards, visualizations, and other interfaces enabling users to specify meta-notable event rules and to view information related to meta-notable events identified based on one or more specified meta-notable event rules. For example, a meta-notable event rule creation GUI can include interface elements allowing users to create notable event states, to identify one or more of the notable event states as end states, and to specify one or more transition rules. As another example, a meta-notable event display GUI can include interface elements graphically displaying meta-notable event rule patterns, interface elements displaying various types of graphs and charts providing information about identified meta-notable events, and interface elements displaying event data associated with identified meta-notable events.

Among other benefits, the described meta-notable framework increases the fidelity with which network security threats and attacks can be detected, can provide better input to various types of risk scoring models, and can better inform analysts when conducting network security investigations. The ability to define and detect meta-notable events improves at least the technological processes of network security threat detection and analysis by more efficiently detecting configurable event data patterns of interest to particular users and across different use cases. Although many of the examples provided herein are described in the context of a network security application, the disclosed meta-notable framework can be used to provide insight into any type of event-based data. In other aspects, embodiments of the invention encompass a computer apparatus and a computer-readable medium configured to carry out the foregoing.

3.1. Security Investigations Overview

As indicated above, one example use for a meta-notable event framework is in conjunction with a security application which can be used to manage and analyze machine-generated data related to the status and operation of various components within an information technology or security environment. At a high level, a security application provides users with visibility into security-relevant threat information by capturing data generated by various networked components (for example, log data, network traffic data, application data, and so forth), generating time-stamped event data based on the captured data, and analyzing the generated time-stamped event data for security-related issues. The analysis of the generated event data can provide a view of an organization's security posture including information about individual system components and broader system-wide security information.

The use of a network security application often involves monitoring and addressing security risks associated with a computing environment as the risks are detected. A network security investigation might begin, for example, with a security analyst viewing an incident review dashboard 910 depicted in FIGS. 9A and 9B and noticing one or more generated notable events in an events list 914. These notable events might be generated based on correlation searches configured to search for indications of unusual activity related to one or more computing devices of a computer network. For example, various notable events might relate to event data indicating instances of a potential malware or virus infection, brute-force login attacks, denial-of-service attacks, or other types of security threats. One or more of the identified notable events may cause an analyst to desire more information about components within the network potentially affected by the identified events.

The following is an example process that could be used to manage notable events displayed on an incident review dashboard 910 or similar interface. An administrative analyst might monitor the dashboard, sorting and performing high-level triage on newly-created notable events. When the analyst determines that a notable event warrants further investigation, the administrative analyst can assign the event to a reviewing analyst to investigate the incident. The reviewing analyst might then perform additional research and collect information about the assigned notable event using the fields and field actions in the notable event. If the research indicates that the notable event merits further investigation, the analyst can assign the notable event to a full investigation and perform the investigation. After the reviewing analyst addresses the cause of the notable event and any remediation tasks have been escalated or solved, the analyst sets the notable event status to resolved in the dashboard.

The notable event management process described above can help a security team manage notable events as the events are generated by a security application. However, as the number of notable events generated increases, this process can become unwieldy and error-prone. For example, if many devices on a network become infected with malware based on a network attack, event data collected from those devices may result in the generation of many notable events indicating the presence of the malware across the network. This deluge of notable events can make it difficult for an analyst to determine which notable events are good candidates for launching an investigation to determine an origin of the attack and to understand an extent of the attack.

3.2. Meta-Notable Framework Overview

According to embodiments described herein, a meta-notable event framework can be used to help security analysts and other users better understand and investigate notable events generated by a network security application or other component of a data intake and query system. As indicated above, a meta-notable event can be defined by a meta-notable event rule including a set of notable event states and a set of transition rules indicating conditions for transitioning from one notable event state to another. In an embodiment, the set of notable event states and transition rules comprising a meta-notable event rule conceptually form a finite-state machine that can be used to determine when a meta-notable event occurs based on an analyzed collection of notable events.

FIG. 18 illustrates a directed graph representing a generic meta-notable event rule including a set of notable event states and a set of transition rules. As shown, the example graph 1800 includes nodes 1808-1818 and edges 1820-1830, where each of the nodes 1808-1818 represents a separate notable event state and each of the edges 1820-1830 represents a transition rule indicating conditions for transitioning from one notable event state to another. The event states represented by nodes 1808-1818 are grouped into three separate phases 1802-1806, where each phase represents an organizational container of one or more notable event states. The three phases 1802-1806 are merely illustrative. In various embodiments, more or fewer phases can be included in a meta-notable event rule. The number of phases can be determined or associated with a particular meta-notable event rule based on a particular condition, security threat, or event data occurrence to be detected.

The nodes 1808-1818 and edges 1820-1830 of graph 1800 collectively define several patterns of notable events linking a start node 1808 to one of end nodes 1816, 1818, where a meta-notable event occurs when a set of notable events satisfies any one of the patterns. For example, the graph 1800 includes a start state 1808. If an analyzed set of notable events includes a notable event satisfying a transition rule represented by edge 1820, the state of the graph 1800 transitions to a “state 1” represented by node 1810. In an embodiment, a notable event satisfies a transition rule if the notable event matches the criteria specified by the transition rule (for example, based on matching one or more field values of the notable event) and the event is not excluded by any filters associated with the transition rule (for example, filters imposing temporal or other constraints on matching notable events). Similarly, if the graph is in a “state 1” and the analyzed set of notable events also includes a second notable event satisfying a transition rule represented by edge 1824, the state of the graph transitions to a “state 3” represented by node 1814, and so forth. More specific examples of notable event states and transition rules are described below in reference to FIG. 19 . As indicated above, a meta-notable event occurs if a set of notable events can be identified satisfying a set of transition rules linking a start state (for example, the state represented by node 1808 in graph 1800) to an end state (for example, the state represented by either node 1816 or 1818).

In an embodiment, an analyzed collection of notable events can include distinct sets of notable events matching a same pattern of a meta-notable event rule. For example, an analyzed collection of notable events might include a first set of notable events A, B and C and a second set of notable events D, E, and F, each of which satisfies the set of transition rules linking the start state 1808 to the “end state 1” 1816 via intermediate nodes 1810 and 1814 (that is, each of the sets satisfies the transition rules linking the notable event states “start”→“state 1”→“state 3”→“end state 1”). An analyzed collection of notable events can also include distinct sets of notable events matching different patterns of the same meta-notable event rule. For example, an analyzed collection of notable events might include a first set of notable events A, B, and C satisfying the state pattern “start”→“state 1”→“state 3”→“end state 1” and a second set of notable events D, E, and F satisfying the state pattern “start”→“state 2”→“state 3”→“end state 2.” Further, a same notable event can be a part of multiple distinct sets of notable events satisfying a meta-notable event rule. For example, a first set of notable events A, B, and C, a second set of notable events A, B, and D, and a third set of notable events A, E, and F might each independently satisfy a set of transition rules linking the start state 1808 to one of end states 1816, 1818, where each of the same notable events A and B are included in multiple meta-notable events.

As indicated above, in one embodiment, the application of a meta-notable event rule includes analyzing a collection of notable events to determine whether any one or more sets of notable events from the collection satisfies the meta-notable event rule. The analysis can be performed against a static set of notable events or a continuously updating set of notable events (that is, the analysis can be performed continuously or periodically over time as new notable events are generated and added to the collection). In an embodiment, the collection of notable events can be generated by any number of separate correlation searches or other notable event sources, where each correlation search is configured to identify event data or patterns of event data and can be configured to execute on a recurring basis. For example, one or more search heads 210 might be configured to execute the correlation searches against event data collected from one or more data sources 202 and stored at one or more data stores 208.

In an embodiment, each of the phases 1802-1806 represents a logical grouping of notable event states. In one example, each of the phases might correspond to a phase of a threat modeling methodology that provides a structured approach to analyzing a wide variety of network security threats. An example threat modeling methodology might include phases such as “Credential Access,” “Discovery,” “Lateral Movement,” “Execution,” “Exfiltration,” and “Command and Control,” where each of the phases is associated with various types of actions that typically occur during that phase during a security attack (for example, actions such as a brute force login attempt, account creation, network sniffing, or other actions might typically occur during a “Credential Access” phase). In one embodiment, one or more of the notable event states comprising a meta-notable event rule might be selected from a set of notable event phases associated with a pre-defined phase. For example, a defined “Credential Access” phase might be associated with a pre-defined set of correlation searches that search for event data indicating particular types of actions (brute force login attempts, network sniffing, and so forth) that typically occur during that phase of an attack. In other examples, users can define custom phases to logically group one or more sets of notable event states added by a user to a meta-notable event rule.

FIG. 19 illustrates a directed graph representing a meta-notable event rule defining a particular type of network security attack. For example, the meta-notable event rule represented by the graph 1900 includes a set of notable event states represented by nodes 1908-1918 and a set of transition rules represented by edges 1920-1928 collectively corresponding to actions likely to occur during a data exfiltration attack. The set of notable event states and transition rules of the graph 1900 thus might have been selected by a user to enable detection of potential data exfiltration attacks based on identified relationships among a collection of notable events.

In FIG. 19 , the nodes 1908-1918 are grouped into three separate phases 1902-1906 labeled “Discovery,” “Execution,” and “Exfiltration,” respectively. As indicated above, these phases group sets of notable event states corresponding to actions known to typically occur during a data exfiltration attack. In this example, each of the individual notable event states might correspond to one or more separate correlation searches created or pre-configured to identify event data corresponding to each of the separate actions and the meta-notable event rule represented by the graph 1900 can be applied against notable events generated by these correlation searches or other sources.

The graph 1900 includes a first transition rule indicated by the edge 1920 connecting the node 1908, representing an initial start state, to the notable event state represented by node 1910. In this example, the transition rule represented by edge 1920 might include criteria specifying that a matching notable event has a field value indicating that the event is associated with “File and directory discovery” (for example, the rule might be stated as “rule_title=‘File and Directory Discovery on $dest$’”). In this example rule, a value identifying a network address of an associated network component is stored using a variable “$dest$” for use in subsequent transition rules. If it determined that an analyzed collection of notable events includes a notable event satisfying this transition rule, the state of the graph 1900 transitions to the state represented by node 1910.

The graph 1900 further includes a second transition rule indicated by edge 1922 connecting the node 1910 to node 1912. The transition rule represented by edge 1922 might, for example, specify criteria indicating that a matching notable event includes a field value indicating that the event is associated with “Network configuration Discovery on $dest$” or “Network connections Discovery on $dest$.” The rule might also include criteria specifying that a timestamp associated with the event indicates that the event occurred within one hour of the previous event satisfying the transition rule 1920, and further specifying that the “$dest$” value of this event matches the “$dest$” value of the previous event. Thus, this example transition rule includes criteria matching a field value (a name of the event), matching a value associated the current event against a value stored from a previous event (the “$dest” value identifying a network address), and a filter indicating a time constraint (that is, the current event is to occur within one hour of the previous event). In general, a transition rule can comprise any combination of rules and filters to determine when a meta-notable event rule transitions from one notable event state to another.

In this example, if an analyzed collection of notable events includes a first notable event satisfying the transition rule represented by edge 1920 and a second notable event satisfying the transition rule represented by edge 1922, the state of the graph 1900 transitions to the state represented by node 1912. Analysis of a collection of notable events can continue to determine whether any sets of three notable events satisfy either transition rules 1920, 1922, and 1926 or transition rules 1920, 1924, and 1928, linking the start state 1908 to one of the end states 1916 or 1918. As indicated above, each identified set of notable events satisfying the transition rules linking a start state to an end state comprises a meta-notable event according to embodiments described herein.

3.3. Applying Meta-Notable Event Rules to Notable Event Data

FIG. 20 is a flow diagram 2000 illustrating an example process for receiving input defining a meta-notable event rule and for analyzing a collection of notable events to detect meta-notable event instances. The various elements of flow diagram 2000 may be performed in a variety of systems, including systems such as a data intake and query system 108 described above. In an embodiment, each of the processes described in connection with the functional blocks described below may be implemented using one or more computer programs, other software elements, or digital logic in any of a general-purpose computer or a special-purpose computer, while performing data retrieval, transformation, and storage operations that involve interacting with and transforming the physical state of memory of the computer.

At block 2002, input is received defining a meta-notable event rule. In one embodiment, the input defining the meta-notable event rule includes information specifying a plurality of notable event states and a plurality of transition rules. As described above in reference to FIGS. 18 and 19 , for example, a collection of notable event states and transition rules comprising a meta-notable event rule conceptually form a state diagram and can be used to determine when a collection of notable events includes one or more sets of notable events satisfying the meta-notable event rule. The input defining a meta-notable event rule can be received by a component of a data intake and query system 108 and stored for subsequent application against a collection of notable event data. As shown below in reference to FIG. 22 , for example, a security application might generate one or more GUIs including interface elements that enable users specify the various components of a meta-notable event rule. In other embodiments, a data intake and query system can receive input defining a meta-notable event rule as a configuration file, a graphical depiction of the rule, or in any other format.

In one embodiment, a data intake and query system provides a meta-notable event rule language having a syntax that can be used to define a meta-notable event rule. The syntax might include, for example, various constructs for defining the phases, notable event states, and transition rules comprising a rule. As an example, a meta-notable event rule language might allow users to specify a set of notable event states using the following syntax: “notable event states={phase #1: state #1, state #2; phase #2: state #3; phase #3: state #4, state #5}.” Here, the example syntax indicates that one or more phases can be specified, each separated by a semicolon (for example, “phase #1: . . . ; phase #2: . . . ; phase #3: . . . ”), and that the notable event states associated with each of the phases can be specified in a comma-separated list following the associated phase (for example, “phase #1: state #1, state #2” to indicate that a phase #1 includes states #1 and #2).

In an embodiment, a meta-notable event rule language can further include syntax for specifying transition or association rules indicating to indicate when a meta-notable event rule transitions from one notable event state to another. In one example, a syntax for specifying transition rules can include constructs to define matching rules, define filters, and to logically combine various defined rules and filters. At a high level, a matching rule specifies one or more conditions used to identify notable events having certain characteristics (for example, to identify notable events having a field value matching a specified value, having a field value exceeding a defined threshold, and so forth). A filter comprises criteria that can be used to remove otherwise matching notable events from a results set (for example, to exclude otherwise matching events that occur outside of a defined time window). Logical operators (for example, “and” and “or”) can be also used to logically combine various matching rules and filters to define a transition rule.

As an example, one type of transition rule might be specified using the syntax “smatch(example_string, example_field),” which returns notable events having the value “example_string” as the value for the field “example_field” in the event. As another example, a transition rule might be specified using the syntax “pmatch(previous_node, previous_field, match_field(optional)),” which returns notable events having a same value in the field “match_field” as the previously matched notable event “previous_node” has in the field “previous_field.” In one embodiment, if no field is provided for the “match_field” parameter, then the rule defaults to using the same field as the “previous_field.”

As another example, a transition rule might be specified using the syntax “tfilter(previous_node, seconds_before, seconds_after, example_expression),” which filters a set of notable events to exclude those events associated with a timestamp that is outside of a time window relative to a timestamp associated with a previously matched notable event. For example, a tfilter rule can be used to filter for notable events in adjacent notable event states that occur within five seconds of each other, within one hour of each other, at least ten minutes apart from one another, and so forth. The set of notable events filtered by a tfilter rule is defined by the expression “example_expression.” In one example, a negative number can be specified for “seconds_before” or “seconds_after” to not exclude any notable events having a timestamp arbitrarily long before or arbitrarily long after a current notable event, respectively. As yet another example, a transition rule might be specified using the syntax “not(expression),” which returns notable events not matched by the expression.

To illustrate an example, consider a user that desires to create a rule for transitioning from a notable event state #1 to a state #2 based on identifying the following condition: one or more notable events with a “rule_title” field having the value “Host With A Recurring Malware Infection ($signature$ On $dest$),” where the value for the “$dest$” variable is the same as the value stored in a “dest” field of a notable event causing the previous transition to state #1. In this example, the following matching rule can be used: “pmatch(State #1, dest) and smatch(Host With A Recurring Malware Infection ($signature$ On $dest$), rule_title).”

Consider again the example above, except where the user desires for the transition rule also to be satisfied if the “rule_title” field has the value “Malicious PowerShell Process detected on $dest$.” For this example, the following matching rule can be used: “pmatch(State #1, dest) and (smatch(Host With A Recurring Malware Infection ($signature$ On $dest$), rule_title) or smatch(Malicious PowerShell Process detected on $dest$, rule_title)),” where the two different matching rules are joined by an “or” operator.

As an additional example, a user might further desire to add a time-based filter to the transition rule specified above. For example, the user might desire for a transition from a state #1 to a state #2 to occur, if the previous matching event was a “Malicious PowerShell . . . ” event, then only if a matching event is associated with a timestamp that is within thirty minutes of the previously matched notable event, and if the previous matching event was a “Host With A Recurring Malware Infection . . . ” event, then within any time period. In this example, the following matching rule can be used: pmatch(State #1, dest) and (tfilter(State #1,0,−1,smatch(Host With A Recurring Malware Infection ($signature$ On $dest$), rule_title)) or tfilter(State #1,0,1800, smatch(Malicious PowerShell Process detected on $dest$, rule_title)).

As indicated above, in various embodiments, a collection of transition rules can be specified by a user using any language similar to that above in a text file, via a graphical user interface, or using any other input mechanism. In other embodiments, a graphical meta-notable event rule tool can be used (for example, to represent a meta-notable event rule as a graph of nodes and edges) which translates a graphical representation of a meta-notable rule into the corresponding meta-notable event rule language statements. In an embodiment, an application of a data intake and query system can execute a specified meta-notable event rule, including specification of notable event states and transition rules as shown above, by processing the syntax of the rule and generating a corresponding set of queries or other mechanisms for identifying notable events matching the specified rules.

At block 2004, a data intake and query system accesses a defined meta-notable event rule to be applied to a collection of notable events. For example, a data intake and query system 104 might access the meta-notable event rule from storage, directly via input received in a GUI, or in any other manner. In an embodiment, accessing the defined meta-notable event rule includes identifying at least the notable event states, event states identified as end states, and transition rules comprising the meta-notable event rule.

At block 2006, a collection of notable events is analyzed using the meta-notable event rule accessed at block 2004. In one embodiment, the analysis of a collection of notable events using the rule includes determining whether any one or more sets of notable events from the collection satisfies a set of transition rules from the plurality of transition rules linking a defined start state to a defined end state of the meta-notable event rule. For example, a search head 210 or other component of a data intake and query system 108 can analyze the notable events using search queries, string matching, logical comparisons, and any other operations and combinations thereof to determine whether any sets of notable events satisfy a meta-notable event rule. The set of notable events can be analyzed sequentially, out of order, in parallel, in groups, or in any fashion to perform the transition rule matching.

Referring again to FIG. 18 , for example, a set of notable events satisfying a meta-notable event rule represented by the graph 1800 includes notable events satisfying transition rules linking the node 1808 representing a start state to one of nodes 1816, 1818, each representing an end state. For example, one set of notable events might include a first notable event satisfying the transition rule represented by edge 1820 (advancing to the notable event state represented by node 1810), a second notable event satisfying the transition rule represented by edge 1824 (advancing to the notable event state represented by node 1814), and a third notable event satisfying the transition rule represented by edge 1828.

At block 2008, it is determined that a set of notable events satisfies the meta-notable event rule. As indicated above, it may be determined that a set of notable events satisfies the meta-notable event rule when the data intake and query system identifies a set of events satisfying transition rules linking a start state to a defined end state of the rule.

At block 2010, a meta-notable event is generated and stored, where the meta-notable event identifies the set of notable events satisfying the meta-notable event rule. For example, the generated meta-notable event may include information identifying the event itself (for example, a label associated with the meta-notable event, a timestamp indicating when the event was generated, and so forth), identifying each of the associated notable events satisfying the rule (for example, based on unique identifiers of each of the notable events, information copied from the associated notable events, or any other data), summarized data about the associated notable events, and any other information about the notable events or combinations thereof. In one embodiment, the meta-notable event identifying the set of notable events satisfying the meta-notable event rule is stored in a data store. For example, the meta-notable event can be stored in a data store 208 in an index shared with other events or in a separate “meta-notable event index.” In other embodiments, a meta-notable event is stored only temporarily, for example, for use in generating one or more GUIs displaying information about the generated meta-notable event.

FIG. 21 is a block diagram illustrating an example system flow for detecting meta-notable events, further illustrating the process described in relation to FIG. 20 . The example meta-notable event system 2100 illustrates various components and processes involved in generating meta-notable events, including notable event generation process 2012, a meta-notable event rule 2110, notable event mappings 2112 generated by a meta-notable event rule 2110, and an example meta-notable event 2114.

The notable event generation process 2102 illustrates that a set of one or more correlation searches 2106 can be used to identify notable events 2108 based on event data stored in one or more data stores 2104. In an embodiment, a meta-notable event rule 2110 can be applied against the collection of notable events 2108 to identify any meta-notable event instances defined by the rule.

As indicated above, when analyzing a meta-notable event rule against a collection of notable events, multiple sets of notable events may satisfy the rule and each individual notable event can be a part of one or more meta-notable event sets. In FIG. 21 , notable event mappings 2112 illustrates example overlapping sets of notable events matching the meta-notable event rule 2110. The meta-notable event 2114 illustrates more detailed information about one particular set of notable events satisfying the meta-notable event rule 2110. For example, each of the constituent notable events of the meta-notable event 2114 is shown including information indicating a transition rule associated the notable event, a user identifier associated with the notable event, and source and destination network addresses. Although the notable events of meta-notable event 2114 are shown having a same set of fields, in general, a collection of notable events analyzed by a meta-notable event rule may or may not have a homogenous set of fields and event data structure.

3.4. Displaying Meta-Notable Event Information

According to various embodiments, a data intake and query system provides graphical user interfaces (GUIs) including interface elements enabling users to provide input to specify meta-notable event rules and displaying information related to detected meta-notable events based on defined rules. The displayed information related to identified meta-notable events can be used by security analysts and other users to refine existing meta-notable event rules, to conduct investigations into security-related issues, and to analyze network security trends, among other uses.

FIG. 22 depicts an example meta-notable event dashboard interface. The meta-notable event dashboard 2200 can be used, for example, to receive input defining a meta-notable event rule and to display various types of visualizations of detected meta-notable events. For example, the dashboard 2200 includes an interface element 2202 which a user can use to provide input specifying a plurality of notable event states. In one embodiment, input specifying notable event states can include information grouping the notable event states into various phases. For example, the example syntax “Intrusion: n1, n2; Attack: n3” might be used to indicate that notable event states “n1” and “n2” are grouped together into a phase labeled “Intrusion” and a notable event state “n3” is included in a separate phase labeled “Attack.”

In an embodiment, an interface element 2204 can be used to identify one or more notable event states as an end state. For example, in response to a user specifying various notable event states using the interface element 2202, one or more selectable elements corresponding to the states might be displayed at element 2204. The identification of one or more of the notable event states using interface element 2204 as end states, for example, indicates that a meta-notable event is to be generated each time the end state is reached during application of the rule against a collection of notable events.

In an embodiment, an interface element 2206 can be used to specify transition rules for a meta-notable event rule. In general, any syntax or graphical elements can be used to specify various types of matching criteria, filters, and other transition rule elements as described above. Although the example dashboard 2200 illustrates creating a meta-notable event rule using the interface elements shown in FIG. 22 , other types of graphical rule creation tools can be used. For example, another meta-notable event rule creation interface might include generating and displaying an editable graph, similar to those shown in FIGS. 18 and 19 , where users can add, remove, and modify graphical representations of event states and transitions rules (for example, using nodes and edges) to create a rule.

FIG. 23 depicts an example map display showing information about meta-notable events identified based on application of a meta-notable event rule. The display 2300, for example, includes several nodes grouped into phases 2302-2306. In this example, each of the nodes displayed in one of the phases 2302-2306 represents a notable event that is part of a meta-notable event satisfying a meta-notable event rule.

As indicated above, each notable event of an analyzed collection can be a part of one or more meta-notable event sets satisfying a meta-notable event rule. The example map diagram of FIG. 23 illustrates a display showing which notable events exist in multiple meta-notable event sets. For example, some of the notable event nodes of display 2300 include two or more in-bound or out-bound edges indicating that the node is part of multiple meta-notable event sets. The display 2300 thus can provide information about which notable events have the most in-bound edges, out-bound edges, or both. This information can be used to indicate to an analyst or other user which notable events might be of greatest interest during a security investigation. The nodes in FIG. 23 , for example, are shaded to indicate which nodes have the most in-bound links. In particular, the display 2300 indicates that the notable event labeled 4873 is included in a relatively large number of meta-notable event sets (as indicated by the three separate in-bound edges). This might indicate to a security analyst, for example, that the notable event 4873 is a good notable event from which to start a security investigation. In other examples, different types of graphical indications can be used to indicate frequently occurring notable events including size of the nodes, colors, shading, and so forth.

FIG. 24 is a diagram illustrating an example probability tree visualization generated based on a set of detected meta-notable events. For example, a set of meta-notable events can be used to determine at each state of a meta-notable event rule what the likelihood is of a transition to a next notable event state of a plurality of possible states. These probabilities can be calculated by counting a number of meta-notable events that follow each of the different possible patterns. As shown in the visualization 2400, for example, these probabilities can be mapped onto a display showing at each state (for example, at a “Discovery on 153.219.43.65” state), a probability that an attack transitions to each of the possible next states (for example, a 90% chance of transitioning to a “Data Encrypted then Exfiltrated” state and a 10% chance of transitioning to a “Data Exfiltrated” state).

The information represented by a probability tree visualization can be used in a number of ways according to various embodiments. For example, the information might be used by a security analyst to triage in the middle of a network security attack. That is, the security analyst can use a probability tree visualization to assess the likelihood of an attacker's actions given the current state of an attack and can prioritize prevention efforts to minimize an expected amount of damage. The type of data illustrated by a probability tree visualization might also be useful to analyze data collected from a network security honeypot and to analyze new threats. In one embodiment, the probability information represented by a probability tree visualization could be used by network security tools (for example, firewalls, anti-virus tools, and so forth) to preemptively take particular security actions in response to detecting an attack is in progress.

FIG. 25 depicts an example meta-notable event dashboard including a node sequence graph. Similar to the dashboard of FIG. 22 , in FIG. 25 an example meta-notable event rule can be specified using interface element 2502 to specify the meta-notable event states, interface element 2504 to specify one or more end states, and interface element 2506 to specify the transition rules. The dashboard 2500 further includes an interface element 2508 used to apply the specified meta-notable event rule against a collection of notable events.

The interface element 2510 illustrates a node sequence graph visualization of meta-notable events identified based on an applied meta-notable event rule. For example, the node sequence graph depicts three phases shown as vertical lines and labeled “Intrusion,” “Attack,” and “Demo,” and including nodes depicted as points on the vertical lines and edges connecting the nodes across the phases. In an embodiment, various graphical indications can be used to illustrate how many meta-notable events satisfy each of the possible patterns across the phases, including a thickness of the edges between nodes, a color of the edges, and so forth.

The interface element 2512 shows a list of matching meta-notable events, including information about notable events comprising each of the matched meta-notable events. For example, the list of interface element 2512 includes columns indicating, for each of the meta-notable events matching the applied meta-notable event rule, hash values identifying the constituent notable events, node labels for the constituent notable events, the phases associated with each of the notable events, a rule title associated with each of the notable events, a security domain associated with each of the notable events, a timestamp for the meta-notable event, a duration of the meta-notable event, a user associated with each of the notable events, network addresses associated with each of the notable events, and so forth. In an embodiment, selection of any one or more the displayed meta-notable events may generate an additional display with more information about the meta-notable event, the constituent notable events, or both.

FIG. 26 depicts an example meta-notable event dashboard similar to that in FIG. 25 including a node sequence graph. In particular, the dashboard 2600 includes an interface element 2602 displaying a node sequence graph in which one of the displayed paths 2604 is selected by a user (for example, by clicking on the path or hovering over the path with an input cursor). In one embodiment, the selection of a path in a node sequence graph causes display of information indicating which meta-notable events match the selected path and a count of the events matching the path. For example, in response to selection of a path, the list of meta-notable event matches in interface element 2606 can be updated to include only those that match the selected path.

4.0. Example Embodiments

Examples of some embodiments are represented, without limitation, in the following clauses:

In an embodiment, a method or non-transitory computer readable medium comprises: accessing a meta-notable event rule, the meta-notable event rule including: a plurality of notable event states, at least one of the plurality of notable event states corresponding to a correlation search used to identify timestamped event data matching one or more search criteria, wherein at least one of the plurality of notable event states is a start state and at least one of the plurality of notable event states is an end state, and a plurality of transition rules, each transition rule defining one or more criteria for transitioning between two notable event states of the plurality of notable event states; analyzing a plurality of notable events using the meta-notable event rule by determining whether any set of notable events from the plurality of notable events satisfies a set of transition rules from the plurality of transition rules linking a start state to an end state of the meta-notable event rule; and in response to determining that a set of events satisfies the meta-notable event rule, storing a record identifying the set of notable events satisfying the meta-notable event rule.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one notable event of the plurality of notable events is generated based on execution of a correlation search.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the record identifying the set of notable events satisfying the meta-notable event rule is a timestamped event including identifiers of each notable event comprising the set of notable events.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the event data comprises a plurality of events, each event including a portion of raw machine data created by one or more components of an information technology or security environment.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one of the analyzed plurality of notable events indicates a potential network security threat involving at least one computing device of an information technology or security environment.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the set of notable events satisfying the meta-notable event rule indicates a potential network security threat involving a plurality of computing devices of a computer network.

In an embodiment, a method or non-transitory computer readable medium further comprises: causing display of a graphical user interface (GUI) including graphical elements used to receive input specifying the plurality of notable event states and the plurality of transition rules.

In an embodiment, a method or non-transitory computer readable medium further comprises: causing display of a graphical user interface (GUI) including graphical elements used to display information related to the stored record identifying the set of notable events satisfying the meta-notable event rule.

In an embodiment, a method or non-transitory computer readable medium further comprises: causing display of a graphical user interface (GUI) including graphical elements used to display information related to the stored record identifying the set of notable events satisfying the meta-notable event rule, the displayed information including information stored as part of at least one of the notable events from the set of notable events satisfying the meta-notable event rule.

In an embodiment, a method or non-transitory computer readable medium further comprises: causing display of a graphical user interface (GUI) including a graph showing relationships among the set of notable events satisfying the meta-notable event rule.

In an embodiment, a method or non-transitory computer readable medium comprises: causing display of a graphical user interface (GUI) including graphical elements used to display an indication, for at least one particular notable event of the set of notable events satisfying the meta-notable event rule, a total number of notable event sets satisfying the meta-notable event rule that include the particular notable event.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the set of transition rules links a start state to the end state based on transitions to one or more intermediate notable event states between the start state and the end state.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the correlation search used to identify the event data matching the one or more search criteria is executed periodically.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the correlation search used to identify the event data matching the one or more search criteria is executed on event data stored in a field-searchable data store.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the correlation search is executed to identify event data stored in a field-searchable data store matching the one or more search criteria, the stored event data comprising time stamped events that include a portion of raw machine data created by a component of an information technology or security environment and which relates to activity of the component in the information technology or security environment.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the correlation search is executed to search for event data stored in a field-searchable data store using a late-binding schema.

In an embodiment, a method or non-transitory computer readable medium further comprises: receiving raw machine data from components of an information technology or security environment; segmenting the received raw machine data into events, each event containing a portion of the collected raw machine data; and for each event, determining a time stamp for the event, associating the time stamp with the event, and storing the event in a field-searchable data store.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the event data includes a portion of raw machine data created by one or more components of an information technology or security environment, and wherein at least one component of the information technology or security environment is one of a desktop computer, a workstation, a laptop computer, a tablet computer, a mobile device, a server, a database, a networking device, an application.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein the event data includes a portion of raw machine data created by one or more components of an information technology or security environment, and wherein the raw machine data includes one or more of log data, wire data, server data, network data, file system information, registry information, and information related to one or more processes or services running on a device.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one transition rule of the plurality of transition rules indicates a field value to be present in notable events satisfying the at least one transition rule.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one transition rule of the plurality of transition rules indicates a field value to be matched between a first notable event matched by the at least one transition rule and a second notable event matched by a previous transition rule.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one transition rule of the plurality of transition rules indicates filter excluding notable events matching one or more filtering conditions.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one transition rule of the plurality of transition rules includes a time-based filter excluding notable events matching one or more time-based filtering conditions.

In an embodiment, a method or non-transitory computer readable medium comprises: wherein at least one transition rule of the plurality of transition rules includes logical connectors connecting two or more matching or filtering conditions.

Other examples of these and other embodiments are found throughout this disclosure.

5.0. Implementation Mechanism—Hardware Overview

According to one embodiment, the techniques described herein are implemented by one or more special-purpose computing devices. The special-purpose computing devices may be desktop computer systems, portable computer systems, handheld devices, networking devices or any other device that incorporates hard-wired and/or program logic to implement the techniques. The special-purpose computing devices may be hard-wired to perform the techniques, or may include digital electronic devices such as one or more application-specific integrated circuits (ASICs) or field programmable gate arrays (FPGAs) that are persistently programmed to perform the techniques, or may include one or more general purpose hardware processors programmed to perform the techniques pursuant to program instructions in firmware, memory, other storage, or a combination thereof. Such special-purpose computing devices may also combine custom hard-wired logic, ASICs, or FPGAs with custom programming to accomplish the techniques.

FIG. 27 is a block diagram that illustrates a computer system 2700 utilized in implementing the above-described techniques, according to an embodiment. Computer system 2700 may be, for example, a desktop computing device, laptop computing device, tablet, smartphone, server appliance, computing mainframe, multimedia device, handheld device, networking apparatus, or any other suitable device.

Computer system 2700 includes one or more busses 2702 or other communication mechanism for communicating information, and one or more hardware processors 2704 coupled with busses 2702 for processing information. Hardware processors 2704 may be, for example, general purpose microprocessors. Busses 2702 may include various internal and/or external components, including, without limitation, internal processor or memory busses, a Serial ATA bus, a PCI Express bus, a Universal Serial Bus, a HyperTransport bus, an Infiniband bus, and/or any other suitable wired or wireless communication channel.

Computer system 2700 also includes a main memory 2706, such as a random access memory (RAM) or other dynamic or volatile storage device, coupled to bus 2702 for storing information and instructions to be executed by processor 2704. Main memory 2706 also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by processor 2704. Such instructions, when stored in non-transitory storage media accessible to processor 2704, render computer system 2700 a special-purpose machine that is customized to perform the operations specified in the instructions.

Computer system 2700 further includes one or more read only memories (ROM) 2708 or other static storage devices coupled to bus 2702 for storing static information and instructions for processor 2704. One or more storage devices 2710, such as a solid-state drive (SSD), magnetic disk, optical disk, or other suitable non-volatile storage device, is provided and coupled to bus 2702 for storing information and instructions.

Computer system 2700 may be coupled via bus 2702 to one or more displays 2712 for presenting information to a computer user. For instance, computer system 2700 may be connected via an High-Definition Multimedia Interface (HDMI) cable or other suitable cabling to a Liquid Crystal Display (LCD) monitor, and/or via a wireless connection such as peer-to-peer Wi-Fi Direct connection to a Light-Emitting Diode (LED) television. Other examples of suitable types of displays 2712 may include, without limitation, plasma display devices, projectors, cathode ray tube (CRT) monitors, electronic paper, virtual reality headsets, braille terminal, and/or any other suitable device for outputting information to a computer user. In an embodiment, any suitable type of output device, such as, for instance, an audio speaker or printer, may be utilized instead of a display 2712.

One or more input devices 2714 are coupled to bus 2702 for communicating information and command selections to processor 2704. One example of an input device 2714 is a keyboard, including alphanumeric and other keys. Another type of user input device 2714 is cursor control 2716, such as a mouse, a trackball, or cursor direction keys for communicating direction information and command selections to processor 2704 and for controlling cursor movement on display 2712. This input device typically has two degrees of freedom in two axes, a first axis (e.g., x) and a second axis (e.g., y), that allows the device to specify positions in a plane. Yet other examples of suitable input devices 2714 include a touch-screen panel affixed to a display 2712, cameras, microphones, accelerometers, motion detectors, and/or other sensors. In an embodiment, a network-based input device 2714 may be utilized. In such an embodiment, user input and/or other information or commands may be relayed via routers and/or switches on a Local Area Network (LAN) or other suitable shared network, or via a peer-to-peer network, from the input device 2714 to a network link 2720 on the computer system 2700.

A computer system 2700 may implement techniques described herein using customized hard-wired logic, one or more ASICs or FPGAs, firmware and/or program logic which in combination with the computer system causes or programs computer system 2700 to be a special-purpose machine. According to one embodiment, the techniques herein are performed by computer system 2700 in response to processor 2704 executing one or more sequences of one or more instructions contained in main memory 2706. Such instructions may be read into main memory 2706 from another storage medium, such as storage device 2710. Execution of the sequences of instructions contained in main memory 2706 causes processor 2704 to perform the process steps described herein. In alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions.

The term “storage media” as used herein refers to any non-transitory media that store data and/or instructions that cause a machine to operate in a specific fashion. Such storage media may comprise non-volatile media and/or volatile media. Non-volatile media includes, for example, optical or magnetic disks, such as storage device 2710. Volatile media includes dynamic memory, such as main memory 2706. Common forms of storage media include, for example, a floppy disk, a flexible disk, hard disk, solid state drive, magnetic tape, or any other magnetic data storage medium, a CD-ROM, any other optical data storage medium, any physical medium with patterns of holes, a RAM, a PROM, an EPROM, a FLASH-EPROM, NVRAM, any other memory chip or cartridge.

Storage media is distinct from but may be used in conjunction with transmission media. Transmission media participates in transferring information between storage media. For example, transmission media includes coaxial cables, copper wire and fiber optics, including the wires that comprise bus 2702. Transmission media can also take the form of acoustic or light waves, such as those generated during radio-wave and infra-red data communications.

Various forms of media may be involved in carrying one or more sequences of one or more instructions to processor 2704 for execution. For example, the instructions may initially be carried on a magnetic disk or a solid state drive of a remote computer. The remote computer can load the instructions into its dynamic memory and use a modem to send the instructions over a network, such as a cable network or cellular network, as modulate signals. A modem local to computer system 2700 can receive the data on the network and demodulate the signal to decode the transmitted instructions. Appropriate circuitry can then place the data on bus 2702. Bus 2702 carries the data to main memory 2706, from which processor 2704 retrieves and executes the instructions. The instructions received by main memory 2706 may optionally be stored on storage device 2710 either before or after execution by processor 2704.

A computer system 2700 may also include, in an embodiment, one or more communication interfaces 2718 coupled to bus 2702. A communication interface 2718 provides a data communication coupling, typically two-way, to a network link 2720 that is connected to a local network 2722. For example, a communication interface 2718 may be an integrated services digital network (ISDN) card, cable modem, satellite modem, or a modem to provide a data communication connection to a corresponding type of telephone line. As another example, the one or more communication interfaces 2718 may include a local area network (LAN) card to provide a data communication connection to a compatible LAN. As yet another example, the one or more communication interfaces 2718 may include a wireless network interface controller, such as a 802.11-based controller, Bluetooth controller, Long Term Evolution (LTE) modem, and/or other types of wireless interfaces. In any such implementation, communication interface 2718 sends and receives electrical, electromagnetic, or optical signals that carry digital data streams representing various types of information.

Network link 2720 typically provides data communication through one or more networks to other data devices. For example, network link 2720 may provide a connection through local network 2722 to a host computer 2724 or to data equipment operated by a Service Provider 2726. Service Provider 2726, which may for example be an Internet Service Provider (ISP), in turn provides data communication services through a wide area network, such as the world wide packet data communication network now commonly referred to as the “Internet” 2728. Local network 2722 and Internet 2728 both use electrical, electromagnetic or optical signals that carry digital data streams. The signals through the various networks and the signals on network link 2720 and through communication interface 2718, which carry the digital data to and from computer system 2700, are example forms of transmission media.

In an embodiment, computer system 2700 can send messages and receive data, including program code and/or other types of instructions, through the network(s), network link 2720, and communication interface 2718. In the Internet example, a server 2730 might transmit a requested code for an application program through Internet 2728, ISP 2726, local network 2722 and communication interface 2718. The received code may be executed by processor 2704 as it is received, and/or stored in storage device 2710, or other non-volatile storage for later execution. As another example, information received via a network link 2720 may be interpreted and/or processed by a software component of the computer system 2700, such as a web browser, application, or server, which in turn issues instructions based thereon to a processor 2704, possibly via an operating system and/or other intermediate layers of software components.

In an embodiment, some or all of the systems described herein may be or comprise server computer systems, including one or more computer systems 2700 that collectively implement various components of the system as a set of server-side processes. The server computer systems may include web server, application server, database server, and/or other conventional server components that certain above-described components utilize to provide the described functionality. The server computer systems may receive network-based communications comprising input data from any of a variety of sources, including without limitation user-operated client computing devices such as desktop computers, tablets, or smartphones, remote sensing devices, and/or other server computer systems.

In an embodiment, certain server components may be implemented in full or in part using “cloud”-based components that are coupled to the systems by one or more networks, such as the Internet. The cloud-based components may expose interfaces by which they provide processing, storage, software, and/or other resources to other components of the systems. In an embodiment, the cloud-based components may be implemented by third-party entities, on behalf of another entity for whom the components are deployed. In other embodiments, however, the described systems may be implemented entirely by computer systems owned and operated by a single entity.

In an embodiment, an apparatus comprises a processor and is configured to perform any of the foregoing methods. In an embodiment, a non-transitory computer readable storage medium, storing software instructions, which when executed by one or more processors cause performance of any of the foregoing methods.

6.0. Extensions and Alternatives

As used herein, the terms “first,” “second,” “certain,” and “particular” are used as naming conventions to distinguish queries, plans, representations, steps, objects, devices, or other items from each other, so that these items may be referenced after they have been introduced. Unless otherwise specified herein, the use of these terms does not imply an ordering, timing, or any other characteristic of the referenced items.

In the foregoing specification, embodiments of the invention have been described with reference to numerous specific details that may vary from implementation to implementation. Thus, the sole and exclusive indicator of what is the invention, and is intended by the applicants to be the invention, is the set of claims that issue from this application, in the specific form in which such claims issue, including any subsequent correction. In this regard, although specific claim dependencies are set out in the claims of this application, it is to be noted that the features of the dependent claims of this application may be combined as appropriate with the features of other dependent claims and with the features of the independent claims of this application, and not merely according to the specific dependencies recited in the set of claims. Moreover, although separate embodiments are discussed herein, any combination of embodiments and/or partial embodiments discussed herein may be combined to form further embodiments.

Any definitions expressly set forth herein for terms contained in such claims shall govern the meaning of such terms as used in the claims. Hence, no limitation, element, property, feature, advantage or attribute that is not expressly recited in a claim should limit the scope of such claim in any way. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense. 

What is claimed is:
 1. A computer-implemented method comprising: identifying a plurality of notable events by executing a plurality of correlation searches against timestamped event data stored by a data intake and query system; identifying a plurality of meta-notable events by determining that a plurality of sets of notable events from the plurality of notable events satisfy a meta-notable event rule, wherein the meta-notable event rule defines: a plurality of notable event states, wherein a notable event state of the plurality of notable event states corresponds to a correlation search of the plurality of correlation searches, and a plurality of transition rules, wherein a transition rule of the plurality of transition rules defines criteria for transitioning between two notable event states of the plurality of notable event states; and causing display of a graphical representation of a notable event from the plurality of notable events, wherein the graphical representation of the notable event includes an indication that the notable event is included in at least two of the plurality of meta-notable events, and wherein the indication comprises a display of two or more inbound edges or two or more outbound edges connecting the graphical representation of the notable event to graphical representations of other notable events from the plurality of notable events.
 2. The computer-implemented method of claim 1, further comprising shading the graphical representation of the notable event based on a number of inbound edges associated with the notable event.
 3. The computer-implemented method of claim 1, further comprising storing a plurality of records representing the plurality of meta-notable events, and wherein each record of the plurality of records is a timestamped event including identifiers of notable events comprising a set of notable events associated with the record.
 4. The computer-implemented method of claim 1, wherein the timestamped event data comprises a plurality of events, and wherein each event includes a portion of raw machine data created by one or more components of an information technology (IT) or security environment.
 5. The computer-implemented method of claim 1, wherein at least one of the plurality of notable events indicates a potential security threat involving a computing device of an information technology (IT) or security environment.
 6. The computer-implemented method of claim 1, wherein a meta-notable event of the plurality of meta-notable events indicates a potential security threat involving a plurality of computing devices of an information technology (IT) or security environment, and wherein the plurality of computing devices are identified by a set of notable events corresponding to the meta-notable event.
 7. The computer-implemented method of claim 1, further comprising causing display of a graphical user interface (GUI) including graphical elements used to receive input specifying the plurality of notable event states and the plurality of transition rules.
 8. The computer-implemented method of claim 1, wherein the graphical representation further includes a graph showing relationships among the plurality of sets of notable events satisfying the meta-notable event rule.
 9. The computer-implemented method of claim 1, wherein the plurality of transition rules links a start state to an end state based on transitions to one or more intermediate notable event states between the start state and the end state.
 10. The computer-implemented method of claim 1, further comprising executing the plurality of correlation searches on a periodic basis.
 11. The computer-implemented method of claim 1, wherein the plurality of correlation searches are executed to identify event data stored in a field-searchable data store matching one or more search criteria, and wherein the event data comprises timestamped events that include a portion of raw machine data created by a component of an information technology (IT) or security environment and which relates to activity of the component in the IT or security environment.
 12. The computer-implemented method of claim 1, further comprising: receiving raw machine data from components of an information technology (IT) or security environment; segmenting the raw machine data into events, wherein each event contains a portion of the raw machine data; and for each event, determining a timestamp for the event, associating the timestamp with the event, and storing the event in a field-searchable data store.
 13. The computer-implemented method of claim 1, wherein the timestamped event data includes a portion of raw machine data created by one or more components of an information technology (IT) or security environment, and wherein the raw machine data includes at least one of: log data, wire data, server data, network data, file system information, registry information, or information related to one or more processes or services running on a device.
 14. The computer-implemented method of claim 1, wherein at least one transition rule of the plurality of transition rules indicates a field value to be present in notable events satisfying the at least one transition rule.
 15. The computer-implemented method of claim 1, wherein at least one transition rule of the plurality of transition rules indicates a field value to be matched between a first notable event matched by the at least one transition rule and a second notable event matched by a previous transition rule.
 16. A non-transitory computer-readable storage medium storing instructions which, when executed by one or more processors, cause performance of operations comprising: identifying a plurality of notable events by executing a plurality of correlation searches against timestamped event data stored by a data intake and query system; identifying a plurality of meta-notable events by determining that a plurality of sets of notable events from the plurality of notable events satisfy a meta-notable event rule, wherein the meta-notable event rule defines: a plurality of notable event states, wherein a notable event state of the plurality of notable event states corresponds to a correlation search of the plurality of correlation searches, and a plurality of transition rules, wherein a transition rule of the plurality of transition rules defines criteria for transitioning between two notable event states of the plurality of notable event states; and causing display of a graphical representation of a notable event from the plurality of notable events, wherein the graphical representation of the notable event includes an indication that the notable event is included in at least two of the plurality of meta-notable events, and wherein the indication comprises a display of two or more inbound edges or two or more outbound edges connecting the graphical representation of the notable event to graphical representations of other notable events from the plurality of notable events. 